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A334011 a(n) is the least integer that can be expressed as the sum of one or more consecutive nonzero heptagonal numbers in exactly n ways. 6
1, 872, 8240232, 263346158075 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, Heptagonal Number

Index to sequences related to polygonal numbers

EXAMPLE

Let S(k, m) denote the sum of m heptagonal numbers starting from the k-th. We have

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

a(2) = S(13, 2) = S(3, 8);

a(3) = S(133, 98) = S(479, 14) = S(168, 77);

a(4) = S(6773, 1785) = S(810, 6006) = S(7467, 1547) = S(38758, 70).

CROSSREFS

Cf. A000566, A054859, A068314, A186337, A298467, A322636, A334007, A334008, A334010, A334012.

Sequence in context: A214285 A251841 A251085 * A206312 A252211 A045258

Adjacent sequences:  A334008 A334009 A334010 * A334012 A334013 A334014

KEYWORD

nonn,hard,more

AUTHOR

Ilya Gutkovskiy, Apr 12 2020

EXTENSIONS

a(4) from Giovanni Resta, Apr 14 2020

STATUS

approved

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Last modified October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)