A261535 Primes of the form Phi(8,n!), where Phi is the cyclotomic polynomial.

2, 17, 1297, 331777, 1503561738404723998944447273369600000001

Offset: 1

Author

Robert Price, Aug 28 2015

Keywords

• nonn

Comments

a(6) is 730 digits.

Links

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

Crossrefs

Cf. A123865, A200906, A259264, A259265, A260478.

Programs

Mathematica

Select[Table[Cyclotomic[8, n!], {n, 0, 200}], PrimeQ]

PARI

for(n=1, 500, if(isprime(k=polcyclo(8, n!)), print1(k", "))) \\ Altug Alkan, Nov 16 2015