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Search: id:A160040
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| A160040 |
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Numbers n such that pi(n) = prime(d_1)*prime(d_2)* ... *prime(d_k), where d_1, d_2, ... d_k is the decimal expansion of n, and the zeroth prime is 1. |
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+0
2
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| 123, 2407, 5224, 8350, 11166, 30843, 51174, 66026, 172451, 202774, 266109, 546322, 1082682, 1830188, 1882036, 2754207, 3351809, 14355351, 23539612, 23539621, 24322837, 63950931, 122924349, 161485470, 204868903, 204868930, 252704792
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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See the references in A008578 for a discussion concerning the zeroth prime.
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LINKS
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Robert G. Wilson v, Table of n, a(n) for n = 1..31 .
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MATHEMATICA
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c = 0; k = 1; lst = {}; fQ[n_] := ( c == Times @@ (IntegerDigits@ n /. {0 -> 1, 1 -> 2, 2 -> 3, 3 -> 5, 4 -> 7, 5 -> 11, 6 -> 13, 7 -> 17, 8 -> 19, 9 -> 23}) ); While[k < 6000000000, If[PrimeQ@k, c++, If[ fQ@k, AppendTo[lst, k]; Print@k]]; k++ ]; lst
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CROSSREFS
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Cf. A008578, A113581. A098683 is a proper subset.
Sequence in context: A103504 A115983 A167231 this_sequence A163711 A068239 A098683
Adjacent sequences: A160037 A160038 A160039 this_sequence A160041 A160042 A160043
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KEYWORD
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nonn,base
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 30 2009
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