A291998 Primes of the form Phi(k, -5), where Phi is the cyclotomic polynomial.

521, 31, 601, 19531, 12207031, 390001, 305175781, 234750601, 60081451169922001, 152587500001, 10910444855403996246103496881, 59509429687890001, 11293772630057337854244300009061892827351888021, 9080418348371887359375390001, 5465713352000770660547109750601

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..31

Yves Gallot, Cyclotomic polynomials and prime numbers

Index entries for cyclotomic polynomials,values at X

Mathematica

Select[Table[Cyclotomic[k, -5], {k, 0, 100}], PrimeQ[#] &]

Crossrefs

Cf. A138925.

Sequence in context: A293105 A286977 A225999 * A300395 A139663 A146340

Adjacent sequences: A291995 A291996 A291997 * A291999 A292000 A292001

Keyword

nonn

Author

Robert Price, Sep 07 2017

Status

approved