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A334012 a(n) is the least integer that can be expressed as the sum of one or more consecutive nonzero octagonal numbers in exactly n ways. 7
1, 1045, 5985 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..3.

Eric Weisstein's World of Mathematics, Octagonal Number

Index to sequences related to polygonal numbers

EXAMPLE

From Seiichi Manyama, May 16 2021: (Start)

Let S(k, m) denote the sum of m octagonal numbers starting from k*(3*k-2). We have

a(1) = S(1, 1);

a(2) = S(19, 1) = S(1, 10);

a(3) = S(45, 1) = S(11, 9) = S(1, 18). (End)

CROSSREFS

Cf. A000567, A054859, A068314, A186337, A298467, A322637, A334007, A334008, A334010, A334011, A344376.

Sequence in context: A345514 A345767 A324320 * A344376 A023067 A344410

Adjacent sequences:  A334009 A334010 A334011 * A334013 A334014 A334015

KEYWORD

nonn,hard,more

AUTHOR

Ilya Gutkovskiy, Apr 12 2020

STATUS

approved

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Last modified December 1 14:10 EST 2021. Contains 349430 sequences. (Running on oeis4.)