46843domain: NAppears in sequencesNonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+281)^2 = y^2.at n=10A129626Numbers n such that phi(n) is a Fibonacci number.at n=35A280592a(n) = prime(n) * prime(2n).at n=33A319613Number of subsets of {1...n} containing all prime indices of the elements.at n=21A324736