1,1

These primes are neither sorted nor uniqued. They are listed in the order found in A259264.

Table of n, a(n) for n=1..6.

OEIS Wiki, Cyclotomic Polynomials at x=sigma(n)

Select[Table[Cyclotomic[5, n!], {n, 0, 200}], PrimeQ]

Cf. A200906.

Sequence in context: A106830 A265798 A259264 * A270221 A270689 A270278

Adjacent sequences: A259262 A259263 A259264 * A259266 A259267 A259268

nonn

Robert Price, Jun 22 2015

approved