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Search: id:A098683
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| A098683 |
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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. |
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+0
4
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| 123, 5224, 11166, 51174, 172451, 546322, 14355351, 23539612, 23539621, 24322837, 122924349, 4575242147
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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122924349 is in the sequence because pi(122924349)=P(1)*P(2)*P(2)*P(9)*P(2)*P(4)*P(3)*P(4)*P(9) where P(i) is i-th prime.
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MATHEMATICA
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Do[d=IntegerDigits[n]; k=Length[d]; If[ !MemberQ[d, 0]&&PrimePi[n]==Product[Prime[d[[j]]], {j, k}], Print[n]], {n, 230000000}]
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CROSSREFS
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Cf. A097227, A098684, A098685, A160040.
Sequence in context: A160040 A163711 A068239 this_sequence A135479 A095761 A121917
Adjacent sequences: A098680 A098681 A098682 this_sequence A098684 A098685 A098686
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KEYWORD
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base,more,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Sep 24 2004
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EXTENSIONS
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Corrected the entries. - Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2009
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