A258355 Numbers n such that cyclotomic polynomial value Phi(9,n!) is prime.

0, 1, 2, 98, 775

Offset

1,3

Comments

All values correspond to certified primes.

a(6) > 5944.

Links

Table of n, a(n) for n=1..5.

Example

2 is in the sequence because Phi(9,2!) = 1 + 2^3 + 2^6 = 73 is prime.

Mathematica

Select[Range[0, 5944], PrimeQ[Cyclotomic[9, #!]] &]

Crossrefs

Cf. A002981, A002982, A046029, A200906.

Sequence in context: A173837 A351447 A036901 * A304423 A316278 A305957

Adjacent sequences: A258352 A258353 A258354 * A258356 A258357 A258358

Keyword

nonn,more

Author

Robert Price, May 27 2015

Status

approved