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Search: id:A131179
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A131179 a(n) = if n mod 2 == 0 then n*(n+1)/2 otherwise (n-1)*n/2 + 1. +0
2
0, 1, 3, 4, 10, 11, 21, 22, 36, 37, 55, 56, 78, 79, 105, 106, 136, 137, 171, 172, 210, 211, 253, 254, 300, 301, 351, 352, 406, 407, 465, 466, 528, 529, 595, 596, 666, 667, 741, 742, 820, 821, 903, 904, 990, 991, 1081, 1082, 1176, 1177, 1275, 1276, 1378, 1379, 1485, 1486 (list; graph; listen)
OFFSET

0,3

CROSSREFS

Cf. A128918.

Sequence in context: A139063 A047341 A091910 this_sequence A079353 A135116 A050187

Adjacent sequences: A131176 A131177 A131178 this_sequence A131180 A131181 A131182

KEYWORD

nonn

AUTHOR

Philippe LALLOUET, Sep 16 2007

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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