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A133228
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Number of primes < square root of n!.
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6
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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; refs; listen; history; internal format)
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OFFSET
| 1,4
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MATHEMATICA
| Table[PrimePi[Sqrt[n! ]], {n, 27}] (* Robert G. Wilson v *)
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CROSSREFS
| Cf. A003604.
Sequence in context: A036718 A134964 A052328 * A036717 A000080 A153447
Adjacent sequences: A133225 A133226 A133227 * A133229 A133230 A133231
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Oct 13 2007
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EXTENSIONS
| 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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