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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
Eric Weisstein's World of Mathematics, Heptagonal Number
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
Sequence in context: A214285 A251841 A251085 * A206312 A252211 A045258
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.)