A374092 - OEIS

A374092

Number of solutions to n = x^2 + x*y + y^2 with 0 < x < y.

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

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OFFSET

0,92

COMMENTS

a(n) = 0 if n == 2 (mod 4). - Robert Israel, Jun 28 2024

LINKS

Table of n, a(n) for n=0..112.

MAPLE

N:= 200: # for a(0) .. a(N)

V:= Array(0..N):

for x from 1 to floor(sqrt(N/3)) do

for y from x+1 do