OFFSET
1,1
FORMULA
Let Li(n) = logarithmic integral of n. a(n) = Li(Li(Li(n)))
PROG
(PARI) \p 100 f(n) = for(x=1, n, print1(floor(Li(Li(Li(10^x))))", ")) Li(x) = { -eint1(log(1/x)) }
CROSSREFS
KEYWORD
nonn
AUTHOR
Cino Hilliard, Jun 30 2004
STATUS
approved