login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A258355 Numbers n such that cyclotomic polynomial value Phi(9,n!) is prime. 0
0, 1, 2, 98, 775 (list; graph; refs; listen; history; text; internal format)
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: A232865 A173837 A036901 * A304423 A316278 A305957

Adjacent sequences:  A258352 A258353 A258354 * A258356 A258357 A258358

KEYWORD

nonn,more

AUTHOR

Robert Price, May 27 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 14:33 EDT 2021. Contains 343177 sequences. (Running on oeis4.)