57401domain: NAppears in sequencesStrong pseudoprimes to base 23.at n=24A020249Divide odd numbers into groups with prime(n) elements and add together.at n=17A034960E.g.f. A(x) satisfies A(x) = exp(x * A(x)^2 * (1 - x*A(x))^2) / (1 - x*A(x)).at n=5A380717