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Search: id:A057752
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| A057752 |
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Difference between Li(10^n) and Pi(10^n), where Li(x) = integral of log(x) and Pi(x) = number of primes <= x (A006880). |
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+0
4
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| 2, 5, 10, 17, 38, 130, 339, 754, 1701, 3104, 11588, 38263, 108971, 314890, 1052619, 3214632, 7956589, 21949555, 99877775, 222744644, 597394254, 1932355208
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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On his prime pages C. K. Caldwell remarks: "However in 1914 Littlewood proved that pi(x)-Li(x) assumes both positive and negative values infinitely often". - Frank Ellermann, May 31, 2003
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REFERENCES
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John H. Conway and R. K. Guy, The Book of Numbers, Copernicus, an imprint of Springer-Verlag, NY, 1995, page 146.
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LINKS
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Chris K. Caldwell, How many primes are there, table, Values of pi(x).
Chris K. Caldwell, How many primes are there, table, Approximations to pi(x).
Xavier Gourdon & Pascal Sebah, Counting the primes
Andrew Granville, Harald Cramer and the Distribution of Prime Numbers
Tomas Oliveira e Silva, Tables of values of pi(x) and of pi2(x)
Eric Weisstein's World of Mathematics, Prime Counting Function
Wikipedia, Prime number theorem
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MATHEMATICA
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Table[Round[LogIntegral[10^n] - PrimePi[10^n]], {n, 1, 13}]
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PROGRAM
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(PARI) A057752=vector(#A006880, i, round(-eint1(-log(10^i))-A006880[i])) - M. F. Hasler (MHasler(AT)univ-ag.fr), Feb 26 2008
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CROSSREFS
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Cf. A006880, A052435, A045916, A057794.
Sequence in context: A107482 A018315 A054964 this_sequence A077631 A025223 A104688
Adjacent sequences: A057749 A057750 A057751 this_sequence A057753 A057754 A057755
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 30 2000
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EXTENSIONS
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More terms from Frank Ellermann, May 31, 2003
The value of a(23) is not known at present, I believe. - njas, Mar 17 2008
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