OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..440
EXAMPLE
59 appears in the sequence because the equation x^2 - 118*y^2 = 59 has integer solutions.
MATHEMATICA
Select[Range[200], Length[FullSimplify[Solve[x^2-2*#*y^2==#, {x, y}, Integers]/.C[1]->1]]>0&] (* Vaclav Kotesovec, Oct 08 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Colin Barker, Oct 07 2013
STATUS
approved