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Search: id:A039506
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| A039506 |
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Number of cluster primes less than 10^n. |
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+0
6
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| 3, 23, 99, 420, 1807, 8287, 40017, 202208, 1059807, 5736717, 31911465, 182019293, 1060723057
(list; graph; listen)
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OFFSET
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1,1
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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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CROSSREFS
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Cf. A038133, A038134, A039507.
Cf. A121044, A121045 (cluster primes near 10^n).
Adjacent sequences: A039503 A039504 A039505 this_sequence A039507 A039508 A039509
Sequence in context: A032017 A024196 A112459 this_sequence A006557 A081628 A122883
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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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