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A090467
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Numbers which are not the regular figurative or polygonal numbers of order greater than 2.
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3
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1, 2, 3, 4, 5, 7, 8, 11, 13, 14, 17, 19, 20, 23, 26, 29, 31, 32, 37, 38, 41, 43, 44, 47, 50, 53, 56, 59, 61, 62, 67, 68, 71, 73, 74, 77, 79, 80, 83, 86, 89, 97, 98, 101, 103, 104, 107, 109, 110, 113, 116, 119, 122, 127, 128, 131, 134, 137, 139, 140, 143, 146, 149, 151, 152
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Albert H. Beiler, Recreations In The Theory Of Numbers, The Queen Of Mathematics Entertains, Dover, NY, 1964, pps. 185-199.
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
| The n-th k-gonal number is 1 +k*n(n-1)/2 - (n-1)^2.
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MATHEMATICA
| Complement[ Table[i, {i, 300}], Take[ Union[ Flatten[ Table[1 + k*n(n - 1)/2 - (n - 1)^2, {n, 3, 40}, {k, 3, 300}]]], 300]]
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CROSSREFS
| Complement is A090466.
Sequence in context: A180121 A062890 A058586 * A177202 A053868 A081730
Adjacent sequences: A090464 A090465 A090466 * A090468 A090469 A090470
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 01 2003
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EXTENSIONS
| Verified by Don Reble (djr(AT)nk.ca), Mar 12 2006
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