A322640 Numbers that are sums of consecutive centered heptagonal numbers (A069099).

0, 1, 8, 9, 22, 30, 31, 43, 65, 71, 73, 74, 106, 114, 136, 144, 145, 148, 177, 197, 220, 242, 250, 251, 253, 254, 316, 325, 345, 368, 386, 390, 398, 399, 450, 451, 463, 522, 547, 565, 569, 587, 595, 596, 598, 638, 702, 704, 736, 766, 775, 818, 840, 841, 848, 849, 914, 953

Offset

1,3

Links

Table of n, a(n) for n=1..58.

Wikipedia, Centered heptagonal number

Mathematica

terms = 58;
nmax = 17; kmax =  8; (* empirical *)
T = Table[(7 n^2 - 7 n + 2)/2, {n, 1, nmax}];
Union[{0}, T, Table[k MovingAverage[T, k], {k, 2, kmax}] // Flatten][[1 ;; terms]] (* Jean-François Alcover, Dec 27 2018 *)

Crossrefs

Cf. A004126, A069099, A152043, A322610, A322611, A322636, A322638, A320728.

Sequence in context: A308989 A048124 A322637 * A303957 A046258 A074344

Adjacent sequences: A322637 A322638 A322639 * A322641 A322642 A322643

Keyword

nonn

Author

Ilya Gutkovskiy, Dec 21 2018

Status

approved