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 A069798 Primes whose digit reversal is a nontrivial power. 3
 23, 61, 163, 487, 521, 691, 821, 1297, 1861, 4201, 4441, 4483, 5209, 5227, 9049, 9631, 12391, 14437, 16141, 16987, 61483, 63211, 65707, 65899, 67057, 69481, 92767, 94273, 96979, 106303, 108061, 123031, 123373, 125329, 127291, 129643, 142771, 146857, 148249 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..14573 EXAMPLE 691 is in the sequence because it is prime and its reversal, 196, is a power (greater than one) of 14. MATHEMATICA f[n_] := Block[{a, p = ToExpression[ StringReverse[ ToString[ Prime[n]]]]}, Log[ Apply[ Times, Transpose[ FactorInteger[p]][[1]]], p]]; Prime[ Select[ Range[10^5], IntegerQ[ f[ # ]] && f[ # ] > 1 &]] PROG (PARI) lista(nn) = {forprime(p=2, nn, if (ispower(subst(Polrev(digits(p)), x, 10)), print1(p, ", ")); ); } \\ Michel Marcus, Jun 03 2016 CROSSREFS Cf. A007488, A067194. Sequence in context: A215166 A141870 A115685 * A067194 A355984 A355985 Adjacent sequences: A069795 A069796 A069797 * A069799 A069800 A069801 KEYWORD base,nonn AUTHOR Amarnath Murthy, Apr 09 2002 EXTENSIONS Edited, corrected and extended by Robert G. Wilson v, Apr 15 2002 Missing terms a(4), a(24), and a(26) added by Chai Wah Wu, Jun 02 2016 STATUS approved

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Last modified November 29 03:03 EST 2023. Contains 367422 sequences. (Running on oeis4.)