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 A090717 Primes which are also prime if their base 64 representation is interpreted as a base 10 number. 1
 2, 3, 5, 7, 67, 71, 73, 131, 137, 193, 199, 257, 263, 449, 457, 521, 4099, 4231, 4289, 4297, 4423, 4483, 4547, 4673, 4679, 8329, 8387, 8513, 8641, 8647, 8707, 12487, 12553, 12611, 12739, 12809, 16649, 16903, 20483, 20611, 20743, 20807, 20873 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE 67 is prime; in base 64 it is written "13" and the base 10 number 13 is also prime. MATHEMATICA b64Q[n_]:= Module[{idn64=IntegerDigits[n, 64]}, Max[idn64]<10&&PrimeQ[FromDigits[idn64]]]; Select[Prime[Range[PrimePi[30000]]], b64Q] (* Vincenzo Librandi, Apr 18 2013 *) CROSSREFS Sequence in context: A237441 A171029 A241723 * A090715 A029976 A074310 Adjacent sequences: A090714 A090715 A090716 * A090718 A090719 A090720 KEYWORD base,nonn AUTHOR Cino Hilliard, Jan 18 2004 EXTENSIONS Edited by Jens Kruse Andersen, May 04 2008 STATUS approved

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Last modified July 17 18:33 EDT 2024. Contains 374377 sequences. (Running on oeis4.)