%I
%S 5,7,47
%N Primes p such that 5^p4 is also prime.
%F A000040 INTERSECT A059613.  _R. J. Mathar_, Apr 15 2010
%e For p=5, 5^54=3121; p=7, 5^74=78121; p=47, 5^474= 710542735760100185871124267578121
%o (MAGMA) [ p: p in PrimesUpTo(3500) IsPrime(5^p4)]
%o (PARI) is(n)=isprime(n) && isprime(5^n4) \\ _Charles R Greathouse IV_, Sep 06 2016
%K nonn,more,bref
%O 1,1
%A _Vincenzo Librandi_, Mar 14 2010
