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Search: id:A076960
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| A076960 |
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Number of primes between n! and (2n)!. |
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+0
1
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| 0, 8, 125, 4222, 258659, 25306159, 3610490130, 706003793908
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2) = 8 as pi(24) = 9 and pi(2) =1.
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MAPLE
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with(numtheory): 0, seq(pi((2*n)!)-pi(n!), n=2..5); (Deutsch)
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MATHEMATICA
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a[n_] := PrimePi[(2n)! - 1] - PrimePi[n! ]; Table[a[n], {n, 1, 8}] (Propper)
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CROSSREFS
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Cf. A076959.
Sequence in context: A061103 A110272 A033536 this_sequence A035130 A055762 A029472
Adjacent sequences: A076957 A076958 A076959 this_sequence A076961 A076962 A076963
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 21 2002
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EXTENSIONS
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Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 31 2005
2 further terms from Ryan Propper (rpropper(AT)stanford.edu), Sep 11 2005
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