

A118715


Numbers n such that the digital reversal of n is a perfect power (A001597).


1



0, 1, 4, 8, 9, 10, 18, 23, 40, 46, 52, 61, 63, 72, 80, 90, 94, 100, 121, 144, 148, 163, 169, 180, 215, 230, 342, 343, 400, 423, 441, 460, 484, 487, 520, 521, 522, 526, 610, 612, 630, 652, 675, 676, 691, 720, 800, 821, 900, 925, 927, 940, 961, 982, 1000, 1042, 1062
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,3


LINKS

Table of n, a(n) for n=1..57.


EXAMPLE

63 is a member of the sequence since its digital reversal, 36=6^2, is the ninth perfect power.


MATHEMATICA

fQ[n_] := Block[{rid = FromDigits@ Reverse@ IntegerDigits@n}, rid == 0  rid == 1  GCD @@ Last /@ FactorInteger@ rid > 1]; Select[ Range[0, 1088], fQ@# &] (* Robert G. Wilson v *)


CROSSREFS

Cf. A001597.
Sequence in context: A251606 A073042 A094349 * A175839 A226085 A104623
Adjacent sequences: A118712 A118713 A118714 * A118716 A118717 A118718


KEYWORD

base,easy,nonn,less


AUTHOR

Giovanni Teofilatto, May 21 2006


EXTENSIONS

Edited and extended by Robert G. Wilson v, May 22 2006


STATUS

approved



