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Search: id:A064225
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| 1, 8, 24, 49, 83, 126, 178, 239, 309, 388, 476, 573, 679, 794, 918, 1051, 1193, 1344, 1504, 1673, 1851, 2038, 2234, 2439, 2653, 2876, 3108, 3349, 3599, 3858, 4126, 4403, 4689, 4984, 5288, 5601, 5923, 6254, 6594, 6943, 7301, 7668, 8044, 8429, 8823, 9226
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Diagonal of triangular spiral in A051682. - Michael Somos Jul 22 2006
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REFERENCES
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National Security Agency, Notices of the AMS, vol. 49 (2001), p. 216.
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FORMULA
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Ehrhart polynomial of closed quadrilateral with vertices (0,2),(2,3),(3,1),(2,0). - Michael Somos Jul 22 2006
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PROGRAM
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(PARI) a(n)=1+n*(9*n+5)/2 /* Michael Somos Jul 22 2006 */
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CROSSREFS
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A064226(n)=a(-1-n).
Sequence in context: A033996 A028612 A068857 this_sequence A054275 A122655 A011925
Adjacent sequences: A064222 A064223 A064224 this_sequence A064226 A064227 A064228
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KEYWORD
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nonn
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AUTHOR
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njas, Sep 22 2001
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