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A000849
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Number of primes <= product of first n primes [A002110(n)].
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6
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0, 1, 3, 10, 46, 343, 3248, 42331, 646029, 12283531, 300369796, 8028643010, 259488750744, 9414916809095, 362597750396740, 15397728527812858
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| C. D. Pruitt, A Theorem & Proof on the Density of Primes Utilizing Primorials [Broken link?]
Tomas Oliveira e Silva, Tables of values of pi(x) and of pi2(x) [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 01 2010]
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MATHEMATICA
| a=1; Table[a=a*Prime[n]; PrimePi[a], {n, 1, 13}]
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CROSSREFS
| Cf. A000720, A002110, A003604.
Sequence in context: A058112 A020008 A167999 * A092429 A005651 A105748
Adjacent sequences: A000846 A000847 A000848 * A000850 A000851 A000852
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KEYWORD
| nonn,hard,more
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AUTHOR
| James D. Ausfahl, gandalf(AT)hrn.office.ssi.net
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EXTENSIONS
| More terms from David W. Wilson (davidwwilson(AT)comcast.net); last 4 terms from Paul.Zimmermann(AT)loria.fr (Paul Zimmermann).
a(14)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 01 2010
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