[2] Find all integers that cannot be written as the sum of 2 or more consecutive integers.

[3] Find all positive integers that can only be written as the sum of 2 or more consecutive positive integers in one way.

[2] All numbers can be done this way. For example 4 = -3+-2+-1+0+1+2+3+4

[3] Primes multiplied by powers of 2. i.e. numbers of the form p*2^n.

blackjack

flooble's webmaster puzzle