34306domain: NAppears in sequencesa(n) is the concatenation of n and 9n.at n=33A009474Indices of primes in sequence defined by A(0) = 53, A(n) = 10*A(n-1) + 33 for n > 0.at n=19A101582Numbers n such that n*2^2203 - 1 is prime.at n=42A265503