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

1,1

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

Formula

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

Mathematica

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

Crossrefs

Cf. A072226, A019320.

Sequence in context: A112927 A097406 A064078 * A342660 A186522 A048857

Adjacent sequences: A292012 A292013 A292014 * A292016 A292017 A292018

Keyword

nonn

Author

Robert Price, Sep 07 2017

Status

approved