OFFSET
1,3
COMMENTS
FORMULA
Empirical g.f.: -x^2*(x+1)*(x^2+x+1)^2 / ((x-1)*(x^6-14*x^3+1)). - Colin Barker, Dec 30 2014
PROG
(PARI) is(n)=issquare(n^2\3+n)
print1("0, 1"); for(x=3, 99, y=round(sqrt(3)*x-3/2); if(is(y), print1(", "y))) \\ Charles R Greathouse IV, Dec 09 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Richard R. Forberg, Nov 29 2013
EXTENSIONS
a(23) corrected by Colin Barker, Dec 30 2014
STATUS
approved