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Search: id:A096354
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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
1
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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; listen)
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OFFSET
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1,1
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COMMENT
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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
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Let Li(n) = logarithmic integral of n. a(n) = Li(Li(Li(Li(n))))
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PROGRAM
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(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
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Sequence in context: A000080 A153447 A076893 this_sequence A076838 A034749 A053024
Adjacent sequences: A096351 A096352 A096353 this_sequence A096355 A096356 A096357
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jun 30 2004
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