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Integer part of the logarithmic integral of the logarithmic integral of 10^n.
1

%I #3 Oct 01 2013 17:58:01

%S 4,13,45,212,1205,7754,54033,397820,3049439,24107782,195301124,

%T 1613855392,13556782136,115465571163,995112789441,8663956923566,

%U 76105986001922,673776966100254,6006525932517904,53878729432248978

%N Integer part of the logarithmic integral of the logarithmic integral of 10^n.

%o (PARI) \p 100 f(n) = for(x=1,n,print1(floor(Li(Li(10^x)))",")) Li(x) = { -eint1(log(1/x)) }

%K nonn

%O 1,1

%A _Cino Hilliard_, Jun 30 2004