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A211875 Primes of the form Phi(phi(k),3), the phi(k)-th Cyclotomic polynomial evaluated at 3, where phi is the Euler totient function. 1
2, 7, 61, 73, 6481, 530713, 42521761, 47763361, 23535794707, 282429005041, 374857981681, 150094634909578633, 13490012358249728401, 105919308797935444986721, 1076050302914923449767311155851656076154481 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Union[Select[Cyclotomic[EulerPhi[#], x] /. x -> 3 & /@ Range[1000], PrimeQ]]
CROSSREFS
Sequence in context: A366328 A091687 A000892 * A065397 A255904 A046846
KEYWORD
nonn
AUTHOR
Alexander Gruber, Feb 12 2013
STATUS
approved

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Last modified June 18 03:29 EDT 2024. Contains 373468 sequences. (Running on oeis4.)