438900domain: NAppears in sequencesa(n) = (4*n-1)*4*n*(4*n+1).at n=19A069140a(n) = A084190(A084190(n)).at n=13A084191Numbers with prime factorization pqrst^2u^2.at n=14A190380a(n) = 3*n*(3*n + 1)*(3*n + 2).at n=24A228889