S000813


Numbers that are not the sum of 3 generalized 14-gonal numbers.

4, 5, 6, 7, 8, 9, 10, 17, 18, 19, 20, 21, 24, 27, 30, 31, 32, 37, 38, 43, 44, 47, 52, 55, 57, 58, 60, 63, 65, 66, 72, 75, 85, 86, 93, 95, 96, 99, 100, 105, 106, 113, 120, 123, 132, 133, 134, 135, 143, 148, 157, 158, 162, 167, 168, 171, 174, 180, 181, 182

1

S000813

This sequence begins slowly, but eventually becomes quadratic (or higher).

T. D. Noe, Plot of 1000 terms

T. D. Noe, Table of 1000 terms

Eric W. Weisstein, MathWorld: Polygonal Number

(Mma) f = 14; nn = 200; t = Table[k ((f - 2) k - (f - 4))/2, {k, -nn, nn}]; t2 = Select[Union[Flatten[Table[a + b + c, {a, t}, {b, t}, {c, t}]]], # <= t[[-1]] &]; Complement[Range[t[[-1]]], t2]

Cf. A118282S000806-S000819.

nonn

T. D. Noe, Dec 28 2015

© Tony D Noe 2014-2015