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Search: id:A110071
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| A110071 |
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Numbers n such that n=pi(d_1!!*d_2!!*...*d_k!!) where d_1 d_2 ... d_k is the decimal expansion of n. |
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+0
3
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OFFSET
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1,2
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COMMENT
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There is no further term up to 73*10^6. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 02 2007
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EXAMPLE
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11387 is in the sequence because 11387=pi(1!!*1!!*3!!*8!!*7!!).
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MATHEMATICA
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Do[h = IntegerDigits[n]; l = Length[h]; If[n == PrimePi[ Product[h[[k]]!!, {k, l}]], Print[n]], {n, 0, 50000}]
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CROSSREFS
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Cf. A097655, A110070, A110072.
Sequence in context: A090088 A110816 A112322 this_sequence A128904 A001537 A027512
Adjacent sequences: A110068 A110069 A110070 this_sequence A110072 A110073 A110074
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KEYWORD
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base,hard,more,nonn
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AUTHOR
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Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Jul 22 2005
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EXTENSIONS
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1656281 added by Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Dec 02 2007
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