%N Numbers such that the arithmetic mean of the 4th power of their prime factors (taken with multiplicity) is a prime.
%H Hieronymus Fischer, <a href="/A134621/b134621.txt">Table of n, a(n) for n = 1..10000</a>
%e a(3)=39, since 39=3*13 and (3^4+13^4)/2=14321 which is prime.
%Y Cf. A001597, A025475, A134333, A134344, A134376.
%Y Cf. A134600, A134602, A134605, A134608, A134613, A134617, A134619.
%A _Hieronymus Fischer_, Nov 11 2007
%E Minor edits by _Hieronymus Fischer_, May 06 2013