67559domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers n such that n, 2n+1, 3n+2, 4n+3 are primes.at n=21A067257Primes of the form (n-1)^6 + n^5 + (n+1)^4.at n=2A191865Smaller member of a Sophie Germain pair in which each member of the pair is the smaller of its prime pair (p, (p*p*p)+2).at n=14A242281Prime numbersat n=6731