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%I #9 Jul 10 2015 00:32:52
%S 5,5,31,346201,209102521,
%T 6813584502670671709484968734757499815278649237224386797415881735111285309440001
%N Primes of the form Phi(5,n!), where Phi is the cyclotomic polynomial.
%C These primes are neither sorted nor uniqued. They are listed in the order found in A259264.
%H OEIS Wiki, <a href="https://oeis.org/wiki/Cyclotomic Polynomials at x=sigma(n)">Cyclotomic Polynomials at x=sigma(n)</a>
%t Select[Table[Cyclotomic[5, n!], {n, 0, 200}], PrimeQ]
%Y Cf. A200906.
%K nonn
%O 1,1
%A _Robert Price_, Jun 22 2015
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