OFFSET
0,2
COMMENTS
a(n) is nonsquare for 1 <= n < 12055735790331359447442538767.
LINKS
FORMULA
G.f.: (1 + 989*x + 992*x^2)/(1 - x)^3.
a(n) = a(n-1) + 991*(2*n - 1).
MAPLE
seq(991*n^2+1, n=0..33);
MATHEMATICA
Table[991*n^2 + 1, {n, 0, 33}]
PROG
(Magma) [991*n^2+1: n in [0..33]];
(PARI) for(n=0, 33, print1(991*n^2+1, ", "));
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Arkadiusz Wesolowski, Feb 16 2014
STATUS
approved