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 A180917 Numbers that are not the sum of three positive heptagonal numbers. 1
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 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 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..1671 CROSSREFS Cf. A000290, A000326, A000384, A000566, A003679, A004214, A007536, A117105. Sequence in context: A047263 A039244 A160044 * A127428 A039187 A001963 Adjacent sequences:  A180914 A180915 A180916 * A180918 A180919 A180920 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Sep 23 2010 EXTENSIONS Comment and b-file from Charles R Greathouse IV, Sep 27 2010 STATUS approved

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Last modified October 23 08:57 EDT 2019. Contains 328345 sequences. (Running on oeis4.)