2888387domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers n such that the Eisenstein integer (1 - ω)^n - 1 has prime norm, where ω = -1/2 + sqrt(-3)/2.at n=26A066408Primes p such that 3^p - 3^((p + 1)/2) + 1 is prime.at n=12A125738Prime numbersat n=209341