A258355 - OEIS

A258355

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

0, 1, 2, 98, 775

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OFFSET

1,3

COMMENTS

All values correspond to certified primes.

a(6) > 5944.

LINKS

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

KEYWORD

nonn,more

AUTHOR

Robert Price, May 27 2015

STATUS

approved