41071domain: NAppears in sequencesStrong pseudoprimes to base 66.at n=16A020292a(n) = 30*n^2 + 1.at n=37A158558Number k such that k^2 + 1 = p*q*r where p,q,r are distinct primes and the sum p+q+r is a perfect square.at n=19A261529