When (or not) did you learn about the Sieve of Eratosthenes
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I never saw it in high school or college. Of course, that was back before Eratosthenes was even born. We did computing on punch cards made from antelope skin where we punched the holes using an awl made from the jawbone of a yak. You don't even want to know what it was like when the reader jammed...
Software Zen:
delete this;Gary Wheeler wrote:
You don't even want to know what it was like when the reader jammed...
Where did you get the jam? Surely this was BS (Before Supermarkets)
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I just had to google it. That means something, no ?
I'd rather be phishing!
It means that your knowledge of the Classics could be better...
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School I think, certainly well before I met my first computer, or even programmable calculator!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay... AntiTwitter: @DalekDave is now a follower!
Ditto. IIRC, this was not long after we learnt division.
Ad astra - both ways!
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
Ages ago in school. I remember it was among the first algorithm we implemented when the new Commodore Plus/4 computers arrived at school... After the VIC 20 it was a huge improvement, so we did a lot of graphical presentations of anything in math and physics... But then I got my personal C64...
"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge". Stephen Hawking, 1942- 2018
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
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Eratosthenes told me when I was a little child. However I didn't pay attention to him, playing with marbles was far more fun.
And now you've lost your marbles as well?
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And now you've lost your marbles as well?
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
About 4 of years back while solving Project Euler problems. I ended up writing this: public class NthPrimeNumber { public string GetNumber() { long number = 0; // All prime numbers are denoted by 6n+1 or 6n-1 format. So, assumming for // 10001st number, n is 100000 (in fact it will be lesser than this) bool[] isComposite = new bool[1000002]; // Since this method will find more than 10001 prime numbers, track how many have been // found already and once we have 10001 as the count, stop int primeNumberCount = 0; int upperBoundRoot = (int)Math.Sqrt(1000001); for (int i = 2; i <= upperBoundRoot; i++) { if (!isComposite[i]) { primeNumberCount++; if (primeNumberCount == 10001) { number = i; break; } for (int k = i * i; k <= 1000001; k += i) isComposite[k] = true; } } // if the count is not 10001 yet, there are more numbers to find for (int i = upperBoundRoot; i < 1000001; i++) { if (!isComposite[i]) { primeNumberCount++; if (primeNumberCount == 10001) { number = i; break; } } } return number.ToString(); } }
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[^]
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
Learned it in Math class. I'm way too old to remember when exactly. :sigh:
The world is going to laugh at you anyway, might as well crack the 1st joke! My code has no bugs, it runs exactly as it was written.
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Gary Wheeler wrote:
You don't even want to know what it was like when the reader jammed...
Where did you get the jam? Surely this was BS (Before Supermarkets)
Ad astra - both ways!
The reader was a wooly mammoth in a perpetually bad mood.
Software Zen:
delete this; -
Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
5th grade math class (1964) what's a computer class? I liked it so much that I would do it to 100 on a blank sheet during idle moments. My other numbers game was doubling from 1 to get powers of 2. That would have been a couple of years earlier.
In theory, theory agrees perfectly with practice. In practice, this is virtually never the case. "*the {VOiCE} says: The truth is analog - not digital." - jonathan HICKMAN
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
I learned about the Sieve of Eratosthenes in my naive past after i thought i had come up with a novel approach at finding primes since you could use part of this sieve approach to compute primes in parallel (don't get me started). When i found out it was just a modified version of his sieve I fell into depression and never tried to do anything novel again. J/K...but seriously.
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
From Carl Sagan's Cosmos (original version)
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Was it in a computer class in high school or college? Did you implement an algorithm? [Sieve of Eratosthenes - Wikipedia](https://en.wikipedia.org/wiki/Sieve\_of\_Eratosthenes) I actually first learned about it from my father when I was 10 or so, and worked it out on paper, haha, for the first 100 or so.
Latest Article - Building a Prototype Web-Based Diagramming Tool with SVG and Javascript Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
So, why did I learn to read more... I was interested in Prime Numbers since I was a kid. When I got my first PC, I decided to write a problem to spin through prime numbers. And I came up with this TOTALLY UNIQUE Idea. Once ANY number becomes prime, all future multiples of that number are no longer prime. (2 being the best example, eliminate every even number in the future) So every number that is not already a multiple of a prime is then prime, etc. And I wrote this, and was amazed that I was able to find primes without division! Mind you: I wrote software to check most of my theory of matrices homework, and Diff Eq stuff... (Because a monochrome computer screen was not good for much else, LOL) So, I explain what I built to my lab partner in crime at University, and he says "Oh, you implemented the Sieve of Eratosthenes..." I was crushed. Then I was excited... (I am only a couple of thousand years behind the greeks... I can catch up)... Then I was crushed... (I had classes). Ah, the good old days...
