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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A180917 Numbers that are not the sum of three positive heptagonal numbers.

Original entry on oeis.org

1, 2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 16, 17, 18, 19, 22, 23, 24, 25, 27, 28, 29, 30, 31, 33, 34, 35, 38, 39, 40, 41, 44, 45, 46, 47, 49, 50, 51, 52, 55, 56, 58, 60, 61, 62, 64, 65, 66, 67, 68, 71, 72, 73, 76, 77, 78, 79, 81, 82, 84, 85, 87, 88, 92, 93, 94, 97, 98, 99, 101
Offset: 1

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Author

Jonathan Vos Post, Sep 23 2010

Keywords

Comments

Complement of A117105. This is to heptagonal numbers A000566,
as A007536 is to hexagonal numbers A000384,
as A003679 is to pentagonal numbers A000326,
and as A004214 is to squares A000290.
This sequence is presumably finite: what is its likely last element?
Last element appears to be a(1671) = 273118. - Charles R Greathouse IV, Sep 27 2010

Links

Crossrefs

Cf. A000290, A000326, A000384, A000566, A003679, A004214, A007536, A117105.
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