200000000001domain: NAppears in sequencesa(n) = sqrt(A077204(n)).at n=22A077205Let P(i) = i-th prime. To get a(n), factor P(n)-1 as a product of primes, then concatenate the exponents.at n=34A097463a(n) = 2*10^n + 1.at n=11A199682