A094116 Partial sums of A093348.

0, 1, 1, 2, 2, 7, 11, 16, 20, 25, 25, 26, 26, 27, 27, 32, 36, 41, 45, 50, 50, 51, 51, 52, 52, 77, 101, 126, 150, 175, 195, 216, 236, 257, 277, 302, 326, 351, 375, 400, 420, 441, 461, 482, 502, 527, 551, 576, 600, 625, 625, 626, 626, 627, 627, 632, 636, 641, 645, 650

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*5^valuation(i,5)))

Formula

a(5^k)=(25^k-1)/12