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A237991 a(n) = 991*n^2 + 1. 0
1, 992, 3965, 8920, 15857, 24776, 35677, 48560, 63425, 80272, 99101, 119912, 142705, 167480, 194237, 222976, 253697, 286400, 321085, 357752, 396401, 437032, 479645, 524240, 570817, 619376, 669917, 722440, 776945, 833432, 891901, 952352, 1014785, 1079200 (list; graph; refs; listen; history; text; internal format)
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
Cf. A154651.
Sequence in context: A161926 A172698 A109149 * A158683 A030645 A010463
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified February 22 05:54 EST 2024. Contains 370240 sequences. (Running on oeis4.)