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Search: id:A070835
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| A070835 |
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Numbers n such that phi(reverse(n)) = sigma(n). |
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+0
1
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| 1, 168, 1141, 1451, 2139, 2737, 3938, 7597, 11831, 19668, 21415, 23649, 31894, 32383, 40649, 52687, 59677, 121023, 133661, 136831, 146055, 148503, 172095, 190035, 245998, 276058, 302005, 302503, 307705, 396635, 410389, 504557, 516439
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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phi(reverse(168)) = phi(861) = 480 = sigma(168), so 168 is a term of the sequence.
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MATHEMATICA
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Select[Range[10^5], EulerPhi[FromDigits[Reverse[IntegerDigits[ # ]]]] == DivisorSigma[1, # ] &]
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CROSSREFS
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Cf. A000203, A000010, A004086.
Sequence in context: A027679 A137863 A110285 this_sequence A112551 A110075 A003807
Adjacent sequences: A070832 A070833 A070834 this_sequence A070836 A070837 A070838
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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), May 16 2002
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EXTENSIONS
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More terms from Labos E. (labos(AT)ana.sote.hu), Jul 04 2003
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