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A118260 Number of weakly carefree couples (a,b) with a,b<=n. 3
1, 3, 7, 11, 19, 23, 35, 43, 51, 59, 79, 87, 111, 123, 139, 153, 185, 197, 233, 247, 271, 291, 335, 351, 377, 401, 427, 445, 501, 517, 577, 603, 643, 675, 723, 745, 817, 853, 901, 929, 1009, 1033, 1117, 1151, 1187, 1231, 1323, 1353, 1405, 1439, 1503, 1541 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..52.

Eric Weisstein's World of Mathematics, Carefree Couple

CROSSREFS

Cf. A118258, A118259.

Sequence in context: A002052 A092109 A117991 * A018805 A191037 A292083

Adjacent sequences:  A118257 A118258 A118259 * A118261 A118262 A118263

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Apr 20 2006

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)