What is so special ???
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What in all gods' name is alphabetical about 8,549? :confused:
8 - Eight 5 - Five 4 - Four 9 - Nine ... goes on... can you notice?
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You must have seen that it has all the numbers from 0-9 once and thus the sum would be 45, which is divisible by 3... not a prime!
Yes I remember this one; if the sum of the digits in a number is divisible by 3 this means that the number is also divisible by 3.
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+10 :thumbsup: & a 5! How long did you took to figure it out?
Sandeep Mewara wrote:
How long did you took to figure it out?
Maybe three seconds to form a hypothesis and another five to test and confirm the truth of it.
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Sandeep Mewara wrote:
How long did you took to figure it out?
Maybe three seconds to form a hypothesis and another five to test and confirm the truth of it.
Terrific! :thumbsup:
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Is it prime? That would be a clue, but I have no hope of even guessing. :-O
8,549,176,320 is even!
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The digits are alphabetical.
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+10 :thumbsup: & a 5! How long did you took to figure it out?
Only works if you say zero as opposed to nought or nothing.
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Yes I remember this one; if the sum of the digits in a number is divisible by 3 this means that the number is also divisible by 3.
The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word. Advertise here – minimum three posts per day are guaranteed.
Deyan Georgiev wrote:
Yes I remember this one; if the sum of the digits in a number is divisible by 3 this means that the number is also divisible by 3.
or if the sum is divisible by 9, so is the original. If the last 2 digits of a number are divisible by 4, so is the whole number, for 8 it's the last 3 digits. I hope no one here needs to be told the tricks for 1, 2, and 5. There is no shortcut for checking if a number is divisible by 7. :doh:
3x12=36 2x12=24 1x12=12 0x12=18
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The following number is the only one of its kind: 8,549,176,320 Can you figure out what is so special about it? P.S.: Give a try, before doing a Google please! :)
If I remember correctly it's the only number divisible by 1-10 with all ten digits. [now I'll read what else has been said]
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8 - Eight 5 - Five 4 - Four 9 - Nine ... goes on... can you notice?
Yeah, got it second time, thanks. Stupid assumption that 'alphabetic' is ascending from 'a' being 1.
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Deyan Georgiev wrote:
Yes I remember this one; if the sum of the digits in a number is divisible by 3 this means that the number is also divisible by 3.
or if the sum is divisible by 9, so is the original. If the last 2 digits of a number are divisible by 4, so is the whole number, for 8 it's the last 3 digits. I hope no one here needs to be told the tricks for 1, 2, and 5. There is no shortcut for checking if a number is divisible by 7. :doh:
3x12=36 2x12=24 1x12=12 0x12=18
Haven’t known the tricks for 4 and 8, thanks!
The narrow specialist in the broad sense of the word is a complete idiot in the narrow sense of the word. Advertise here – minimum three posts per day are guaranteed.
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+10 :thumbsup: & a 5! How long did you took to figure it out?
But "nought" comes before "two" and "three". ;P
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You must have seen that it has all the numbers from 0-9 once and thus the sum would be 45, which is divisible by 3... not a prime!
Sandeep Mewara wrote:
You must have seen that it has all the numbers from 0-9 once and thus the sum would be 45, which is divisible by 3... not a prime!
Geez, that's complicated. It ends with a zero. It's divisible (at minimum) by 2, 5 and 10. No need to reach for further complexity to determine that it's not a prime! Marc