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A113622
Numbers k such that the reverse of the representation of phi(k) is a substring of k, in base 10.
1
1, 21, 63, 270, 291, 1065, 2991, 6102, 10087, 10279, 10654, 16528, 144069, 1440069, 10253179, 10657654, 14400069, 16163608, 46676013, 69460293, 2346534651, 2369436474, 6313047393, 10270341004, 10657657654, 14406534069, 23400000651
OFFSET
1,2
COMMENTS
If p = 480...023 is prime, then k = 3*p = 1440...069 and phi(k) = 960...044, thus k belongs to the sequence.
EXAMPLE
phi(1_440069) = 960044.
MATHEMATICA
lst = {}; Do[If[{}!= StringPosition[ToString@n, StringReverse@ToString@EulerPhi@n], AppendTo[lst, n], {n, 2*10^7}]; lst
CROSSREFS
Sequence in context: A033850 A251213 A170930 * A069215 A115921 A251808
KEYWORD
base,nonn
AUTHOR
Giovanni Resta, Jan 26 2006
EXTENSIONS
a(19)-a(27) from Donovan Johnson, May 11 2010
STATUS
approved