|
| |
|
|
A074452
|
|
Treated as strings, phi(n) is a substring of sigma(n).
|
|
0
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
EXAMPLE
| phi(84) = 24, a substring of sigma(24) = 224, so 84 is a term of the sequence.
|
|
|
MATHEMATICA
| r = {}; Do[If[StringPosition[ToString[DivisorSigma[1, i]], ToString[EulerPhi[i]]] != {}, r = Append[r, i]], {i, 1, 10^5}]; r
|
|
|
CROSSREFS
| Sequence in context: A136927 A061475 A136937 * A168618 A185288 A189000
Adjacent sequences: A074449 A074450 A074451 * A074453 A074454 A074455
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 25 2002
|
| |
|
|
