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 A090716 Primes which are also prime if their base 32 representation is interpreted as a base 10 number. 1

%I #10 Oct 01 2013 17:57:57

%S 2,3,5,7,41,67,73,97,103,131,163,193,199,227,233,1031,1033,1129,1223,

%T 1319,1321,2081,2153,2243,2273,2339,3079,3169,3209,3271,3299,3331,

%U 4201,4289,5351,5417,6151,6337,7177,7369,8263,8297,8387,8423,9257,9319,9511

%N Primes which are also prime if their base 32 representation is interpreted as a base 10 number.

%H Vincenzo Librandi, <a href="/A090716/b090716.txt">Table of n, a(n) for n = 1..1000</a>

%e 41 is prime; in base 32 it is written "19" and the base 10 number 19 is also prime.

%t b32Q[n_]:= Module[{idn32=IntegerDigits[n, 32]}, Max[idn32]<10&&PrimeQ[FromDigits[idn32]]]; Select[Prime[Range[PrimePi[10000]]], b32Q] (* _Vincenzo Librandi_, Apr 18 2013 *)

%K base,nonn

%O 1,1

%A _Cino Hilliard_, Jan 18 2004

%E Edited by _Jens Kruse Andersen_, May 04 2008

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Last modified August 8 04:35 EDT 2024. Contains 375018 sequences. (Running on oeis4.)