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A028993 Odd 10-gonal (or decagonal) numbers. 1
1, 27, 85, 175, 297, 451, 637, 855, 1105, 1387, 1701, 2047, 2425, 2835, 3277, 3751, 4257, 4795, 5365, 5967, 6601, 7267, 7965, 8695, 9457, 10251, 11077, 11935, 12825, 13747, 14701, 15687, 16705, 17755, 18837, 19951, 21097, 22275 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

LINKS

Eric Weisstein's World of Mathematics, Source

FORMULA

(2n+1)(8n+1) [ N. J. A. Sloane (njas(AT)research.att.com) ].

CROSSREFS

Sequence in context: A043962 A035074 A036925 * A007266 A098320 A034990

Adjacent sequences:  A028990 A028991 A028992 * A028994 A028995 A028996

KEYWORD

nonn

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

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Last modified February 13 15:00 EST 2012. Contains 205519 sequences.