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A291991
Primes of the form Phi(k, -9), where Phi is the cyclotomic polynomial.
1
73, 530713, 6481, 47763361, 42521761, 150094634909578633, 13490012358249728401, 282429005041, 19966781110160346782368664772328944885905284750420567849, 1076050302914923449767311155851656076154481
OFFSET
1,1
MATHEMATICA
Select[Table[Cyclotomic[k, -9], {k, 0, 100}], PrimeQ[#] &]
CROSSREFS
Cf. A138921.
Sequence in context: A232307 A232457 A262662 * A188957 A159438 A291992
KEYWORD
nonn
AUTHOR
Robert Price, Sep 07 2017
STATUS
approved