144439domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 1 + 2*n + n^2 + 2*n^3 + n^4.at n=19A165563Primes containing the string 444.at n=25A166582a(2n)=A165568(n). a(2n+1)=A165563(n).at n=39A171733Prime numbersat n=13377