%I #5 Aug 20 2015 16:33:13
%S 3,31,14281,25396561,
%T 273552658381614558353373506071127403199540399874192973440773009599175173339925708800000001
%N Primes of the form Phi(6,n!), where Phi is the cyclotomic polynomial.
%H OEIS Wiki, <a href="https://oeis.org/wiki/Cyclotomic Polynomials at x=n, n! and sigma(n)">Cyclotomic Polynomials at x=n, n! and sigma(n)</a>
%t Select[Table[Cyclotomic[6, n!], {n, 0, 200}], PrimeQ]
%Y Cf. A002061, A200906, A259264, A259265.
%K nonn
%O 1,1
%A _Robert Price_, Aug 20 2015