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Search: id:A074452
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| A074452 |
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Treated as strings, phi(n) is a substring of sigma(n). |
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+0
1
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| 1, 6, 60, 84, 112, 141, 168, 252, 270, 294, 450, 570, 1188, 1320, 2376, 2436, 2508, 4584, 5016, 5406, 6426, 7110, 8850, 13566, 14270, 15834, 17416, 23320, 31152, 34452, 58520, 62568, 72732, 75210, 79035
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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phi(84) = 24, a substring of sigma(24) = 224, so 84 is a term of the sequence.
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MATHEMATICA
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r = {}; Do[If[StringPosition[ToString[DivisorSigma[1, i]], ToString[EulerPhi[i]]] != {}, r = Append[r, i]], {i, 1, 10^5}]; r
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CROSSREFS
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Sequence in context: A136927 A061475 A136937 this_sequence A007358 A007357 A002827
Adjacent sequences: A074449 A074450 A074451 this_sequence A074453 A074454 A074455
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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), Sep 25 2002
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