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Search: id:A071525
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| A071525 |
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Numbers n such that sigma(phi(n))=reversal(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 are no other terms up to 10^7. - Jason Earls (zevi_35711(AT)yahoo.com), Jun 04 2002
There are no other terms up to 45*10^7. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 26 2007
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EXAMPLE
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sigma(phi(304)) = 403 = reverse(304).
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MATHEMATICA
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Select[Range[10^5], DivisorSigma[1, EulerPhi[ # ]] == FromDigits[Reverse[IntegerDigits[ # ]]] &]
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CROSSREFS
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Sequence in context: A119049 A119067 A052505 this_sequence A157583 A085319 A123032
Adjacent sequences: A071522 A071523 A071524 this_sequence A071526 A071527 A071528
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jun 02 2002
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EXTENSIONS
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More terms from Jason Earls (zevi_35711(AT)yahoo.com), Jun 04 2002
Definition restored by Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 26 2007
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