57691domain: NAppears in sequencesa(n) = n*(2*n^2 - 2*n + 1).at n=31A059722a(n) = (prime(n)^4 - 1) / 240.at n=14A089034Numbers k such that 10^k + 4*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=24A102934Fibonacci sequence beginning 11, 7.at n=19A206419