A374017 Number of solutions to x^2 + 11*y^2 = n in positive integers x and y.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 2

Offset

0,61

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Prog

(PARI) a(n) = if(n==0, 0, sum(k=1, sqrtint((n-1)\11), issquare(n-11*k^2)));

Crossrefs

Cf. A092573, A216279, A216511.

Cf. A374160.

Sequence in context: A368980 A355549 A347438 * A373974 A245196 A259362

Adjacent sequences: A374014 A374015 A374016 * A374018 A374019 A374020

Keyword

nonn,easy

Author

Seiichi Manyama, Jun 29 2024

Status

approved