A094115 Partial sums of A093347.

0, 1, 1, 4, 6, 9, 9, 10, 10, 19, 27, 36, 42, 49, 55, 64, 72, 81, 81, 82, 82, 85, 87, 90, 90, 91, 91, 118, 144, 171, 195, 220, 244, 271, 297, 324, 342, 361, 379, 400, 420, 441, 459, 478, 496, 523, 549, 576, 600, 625, 649, 676, 702, 729, 729, 730, 730, 733, 735, 738, 738

Offset

1,4

Links

Table of n, a(n) for n=1..61.

Formula

a(3^k)=(9^k-1)/8

Prog

(PARI) a(n)=sum(k=1, n, -sum(i=1, k-1, (-1)^i*3^valuation(i, 3)))

Crossrefs

Sequence in context: A197575 A201660 A341577 * A339856 A163297 A051679

Adjacent sequences: A094112 A094113 A094114 * A094116 A094117 A094118

Keyword

nonn

Author

Benoit Cloitre, May 03 2004

Status

approved