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Search: id:A118715
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| A118715 |
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Numbers n such that the digital reversal of n is a perfect power (A001597). |
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+0
2
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| 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; listen)
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OFFSET
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1,3
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EXAMPLE
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63 is a member of the sequence since its digital reversal, 36=6^2, is the ninth perfect power.
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MATHEMATICA
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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 *)
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CROSSREFS
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Cf. A001597.
Sequence in context: A124982 A073042 A094349 this_sequence A104623 A078137 A134622
Adjacent sequences: A118712 A118713 A118714 this_sequence A118716 A118717 A118718
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KEYWORD
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base,easy,nonn,less
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), May 21 2006
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), May 22 2006
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