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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
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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 kth. 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 February 28 06:32 EST 2024. Contains 370387 sequences. (Running on oeis4.)