79025domain: NAppears in sequencesBeach-Williams Pell numbers of type pqrs (p,q,r,s primes).at n=2A212080Principal diagonal of the convolution array A213838.at n=24A213839a(n) = Sum_{k=0..3} f(n+k)^2 where f=A130519.at n=33A238604The position of the first occurrence of n in A347249.at n=10A347375