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A118258 Numbers of carefree couples (a,b) with a,b<=n. +0
3
1, 3, 7, 9, 16, 20, 31, 35, 39, 46, 63, 67, 87, 98, 112, 119, 146, 152, 182, 189, 209, 228, 265, 273, 286, 308, 321, 330, 375, 391, 440, 453, 486, 515, 554, 565, 624, 657, 698, 712, 778, 801, 871, 888, 906, 946, 1022, 1037, 1063, 1080, 1133, 1152, 1236, 1252 (list; graph; listen)
OFFSET

1,2

LINKS

Eric Weisstein's World of Mathematics, Carefree Couple

CROSSREFS

Cf. A118259, A118260.

Adjacent sequences: A118255 A118256 A118257 this_sequence A118259 A118260 A118261

Sequence in context: A070993 A128539 A057463 this_sequence A117583 A126106 A064194

KEYWORD

nonn

AUTHOR

Eric Weisstein (eric(AT)weisstein.com), Apr 20, 2006

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.


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