1^2 + 2^2 + ... + n^2 = n(n+1)(2n+1)/6 => (14*15*29 - 9*10*19)/6*365 => 30*(7*29 - 3*19)/6*365 => (7*29 - 3*19)/73 => 146/73 => 2 ;-)

Ariel Serrano Informatica Ambientale S.r.l. (www.iambientale.it) Via Teodosio, 13, 20131, MI Milan, Italy.