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A334524

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^2 + 5xy = 0.

1, 5, 9, 13, 17, 29, 33, 37, 41, 45, 65, 69, 73, 77, 81, 101, 105, 109, 113, 117, 153, 157, 161, 165, 169, 181, 185, 189, 193, 197, 233, 237, 241, 245, 249, 261, 273, 277, 281, 285, 321, 325, 329, 333, 337, 373, 377, 381, 385, 397, 417, 421, 425, 429, 433, 445

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

If n is squarefree and not divisible by 5, a(n) = a(n-1)+4. - Robert Israel, Jun 29 2020

LINKS

Brandon Crofts, Table of n, a(n) for n = 0..20000 (first 10001 terms from Robert Israel)

Brandon Crofts, Mathematica code for 334524

MAPLE

df:= proc(n) local t, s, m0, m;

if n mod 5 = 0 then

m:= n/5;