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A007536
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Numbers that are not the sum of 3 hexagonal numbers (probably finite).
(Formerly M3244)
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4
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4, 5, 9, 10, 11, 14, 19, 20, 23, 24, 25, 26, 32, 33, 37, 38, 39, 41, 42, 48, 50, 53, 54, 55, 59, 63, 64, 65, 69, 70, 76, 77, 80, 83, 85, 86, 89, 99, 102, 104, 108, 110, 113, 114, 115, 116, 123, 124, 128, 129, 130, 131
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| R. K. Guy, Every number is expressible as the sum of how many polygonal numbers?, Amer. Math. Monthly 101 (1994), 169-172.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..638
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CROSSREFS
| Sequence in context: A189136 A116026 A115915 * A064801 A109825 A193259
Adjacent sequences: A007533 A007534 A007535 * A007537 A007538 A007539
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KEYWORD
| nonn,fini,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu) remarks that a(638) = 146858 is probably the last term.
Corrected by T. D. Noe, Feb 14 2007
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