A292015 Primes of the form Phi(k, 2), where Phi is the cyclotomic polynomial.

3, 7, 5, 31, 3, 127, 17, 73, 11, 13, 8191, 43, 151, 257, 131071, 524287, 683, 241, 2731, 262657, 331, 2147483647, 65537, 599479, 43691, 174763, 61681, 5419, 2796203, 4432676798593, 15790321, 2305843009213693951, 715827883, 145295143558111, 10052678938039

Offset: 1

Author

Robert Price, Sep 07 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..89
• Yves Gallot, Cyclotomic polynomials and prime numbers
• Index entries for cyclotomic polynomials,values at X

Crossrefs

Cf. A072226, A019320.

Programs

Mathematica

Select[Table[Cyclotomic[k,2], {k, 0, 100}], PrimeQ[#] &]

Formula

a(n) = A019320(A072226(n)). - Max Alekseyev, Apr 25 2018