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Search: id:A097644
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| A097644 |
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Numbers n such that pi(n)=reversal(n). |
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+0
1
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| 51, 130, 370, 8201, 73270, 82080, 26113610, 4854248220, 37682961610
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This sequence has only two odd terms, i.e. 51 and 8201 and 10 divides all other terms. Next term is greater than 10^8.
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EXAMPLE
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26113610 is in the sequence because
pi(26113610)=1631162=reversal(26113610).
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MATHEMATICA
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Do[If[PrimePi[m]==FromDigits[Reverse[IntegerDigits[m]]], Print[m]], {m, 100000000}]
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CROSSREFS
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Cf. A037171, A069215.
Adjacent sequences: A097641 A097642 A097643 this_sequence A097645 A097646 A097647
Sequence in context: A129298 A065010 A116630 this_sequence A044302 A044683 A044383
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KEYWORD
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base,nonn
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AUTHOR
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Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Aug 25 2004
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EXTENSIONS
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Two more terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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