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Search: id:A039507
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| A039507 |
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Number of odd non-cluster primes less than 10^n. |
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+0
4
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| 0, 1, 68, 808, 7784, 70210, 624561, 5559246, 49787726, 449315793, 4086143347, 37425892724, 345004813781
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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The Blecksmith paper gives incorrect values of a(n) for n>8. - T. D. Noe (noe(AT)sspectra.com), Jul 21 2006
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REFERENCES
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Richard Blecksmith, Paul Erdos, and J. L. Selfridge, Cluster Primes, Amer. Math. Monthly, 106 (1999), 43-48.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to numbers of primes in various ranges
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FORMULA
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a(n)=A006880(n)-A039506(n)-1 - T. D. Noe (noe(AT)sspectra.com), Jul 21 2006
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CROSSREFS
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Cf. A038133, A038134, A039506.
Sequence in context: A044781 A032510 A027850 this_sequence A017784 A035729 A035802
Adjacent sequences: A039504 A039505 A039506 this_sequence A039508 A039509 A039510
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KEYWORD
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nonn
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Feb 15 1999.
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Jul 21 2006
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