A094117 Partial sums of A093349.

0, 1, 1, 2, 2, 3, 3, 10, 16, 23, 29, 36, 42, 49, 49, 50, 50, 51, 51, 52, 52, 59, 65, 72, 78, 85, 91, 98, 98, 99, 99, 100, 100, 101, 101, 108, 114, 121, 127, 134, 140, 147, 147, 148, 148, 149, 149, 150, 150, 199, 247, 296, 344, 393, 441, 490, 532, 575, 617, 660, 702, 745

Offset: 1

Author

Benoit Cloitre, May 03 2004

Keywords

• nonn

Programs

PARI

a(n)=sum(k=1,n,-sum(i=1,k-1,(-1)^i*7^valuation(i,7)))

Formula

a(7^k)=(49^k-1)/16