997057domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = A005148(n)/8^(b(n)-1) where b(n) denotes the number of 1's in the binary representation of n.at n=4A074774Primes of form 3*p*(p-1)+1 with p also a prime.at n=27A165683Prime numbersat n=78283