OFFSET
1,2
EXAMPLE
37 appears in the sequence because the equation x^2 - 111*y^2 = 37 has integer solutions.
MATHEMATICA
Select[Range[300], Length[FullSimplify[Solve[x^2-3*#*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