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Partial sums of A093349.
0

%I #5 Mar 30 2012 18:39:22

%S 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,

%T 85,91,98,98,99,99,100,100,101,101,108,114,121,127,134,140,147,147,

%U 148,148,149,149,150,150,199,247,296,344,393,441,490,532,575,617,660,702,745

%N Partial sums of A093349.

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

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

%K nonn

%O 1,4

%A _Benoit Cloitre_, May 03 2004