392297domain: NPropertiesPrimalityPrimeyesAppears in sequencesTwin primes belonging to packs of four or more twin pairs.at n=30A068220G.f.: A(x) = Sum_{n>=0} x^n/(1-x)^A038722(n), where A038722(n) = floor(sqrt(2*n)+1/2)^2 - n + 1.at n=18A192317Prime numbersat n=33257