OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Square Number
FORMULA
A025431(a(n)) = n for a(n) > 0.
EXAMPLE
a(1) = 7 because 7 is the smallest number with exactly 1 representation as a sum of 7 nonzero squares: 7 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2;
a(2) = 22 because 22 is the smallest number with exactly 2 representations as a sum of 7 nonzero squares: 22 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 4^2 = 1^2 + 1^2 + 2^2 + 2^2 + 2^2 + 2^2 + 2^2, etc.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, May 20 2017
STATUS
approved