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A322640 Numbers that are sums of consecutive centered heptagonal numbers (A069099). 5
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 (list; graph; refs; listen; history; text; internal format)
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-Fran├žois 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

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Last modified June 15 11:22 EDT 2021. Contains 345048 sequences. (Running on oeis4.)