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A096354
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Integer part of the fourth nesting of the logarithmic integral of 10^n.
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0
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2, 4, 9, 19, 51, 177, 747, 3638, 19691, 115237, 716530, 4675989, 31744547, 222714791, 1606590368, 11868687555, 89506353843, 687275943030, 5361745095952, 42423407975227
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| m=4 in PARI below. With nesting level 7, z < 1 and Li(z) is not defined so an error occurs. This is why we take the absolute value of Li(z).
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FORMULA
| Let Li(n) = logarithmic integral of n. a(n) = Li(Li(Li(Li(n))))
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PROG
| (PARI) g(n, m) = for(x=1, n, z=10^x; for(y=1, m, z=abs(Li(z))); print1(floor(z)", ")) Li(x) = { -eint1(log(1/x)) }
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CROSSREFS
| Sequence in context: A153447 A076893 A176501 * A076838 A034749 A053024
Adjacent sequences: A096351 A096352 A096353 * A096355 A096356 A096357
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KEYWORD
| nonn
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Jun 30 2004
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