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Search: id:A105466
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| A105466 |
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Number of irregular primes less than or equal to the m-th prime, where m = floor(exp(n)). |
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+0
3
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OFFSET
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1,3
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COMMENT
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Limit_{n->inf.} a(n)/e^n = 1-e^(-1/2).
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MATHEMATICA
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ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[Floor[E^n]] &]], {n, 10}]
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CROSSREFS
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Cf. A105457, A105461.
Sequence in context: A075979 A128681 A040175 this_sequence A018504 A140812 A018513
Adjacent sequences: A105463 A105464 A105465 this_sequence A105467 A105468 A105469
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KEYWORD
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hard,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 07 2005
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EXTENSIONS
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Definition clarified by N. J. A. Sloane (njas(AT)research.att.com), Jan 19 2009
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