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A074241 Numbers n such that phi(n+1) = reverse(phi(n)). 0
1, 3, 15, 129, 833, 5044, 59815 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

phi(129 + 1) = 48 = reverse(84) = reverse(phi(129)), so 129 is a term of the sequence.

MATHEMATICA

Select[Range[10^5], FromDigits[Reverse[IntegerDigits[EulerPhi[ # ]]]] == EulerPhi[ # + 1] &]

CROSSREFS

Sequence in context: A135255 A182489 A075475 * A228365 A117694 A264795

Adjacent sequences:  A074238 A074239 A074240 * A074242 A074243 A074244

KEYWORD

nonn,base

AUTHOR

Joseph L. Pe, Sep 18 2002

STATUS

approved

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Last modified February 19 22:38 EST 2019. Contains 320328 sequences. (Running on oeis4.)