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Search: id:A133228
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| A133228 |
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Number of primes < square root of n!. |
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+0
7
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| 0, 0, 1, 2, 4, 9, 19, 46, 110, 291, 822, 2455, 7740, 25635, 88849, 320749, 1202674, 4670156, 18741145, 77553119, 330321299, 1445829174, 6493985903, 29891948760, 140843699641, 678576973614, 3339785593878
(list; graph; listen)
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OFFSET
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1,4
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MATHEMATICA
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Table[PrimePi[Sqrt[n! ]], {n, 27}] (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A003604.
Sequence in context: A036718 A134964 A052328 this_sequence A036717 A000080 A153447
Adjacent sequences: A133225 A133226 A133227 this_sequence A133229 A133230 A133231
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KEYWORD
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nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Oct 13 2007
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 14 2007
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