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A070835
Numbers n such that phi(reverse(n)) = sigma(n).
3
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, 539327, 571577
OFFSET
1,2
LINKS
EXAMPLE
phi(reverse(168)) = phi(861) = 480 = sigma(168), so 168 is a term of the sequence.
MATHEMATICA
Select[Range[10^5], EulerPhi[FromDigits[Reverse[IntegerDigits[ # ]]]] == DivisorSigma[1, # ] &]
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Joseph L. Pe, May 16 2002
EXTENSIONS
More terms from Labos Elemer, Jul 04 2003
STATUS
approved