2671715093domain: NAppears in sequencesa(0)=1, a(1)=3, a(n) = 8*a(n-1) - a(n-2).at n=11A144479x-values in the solution to 15*x^2 - 14 = y^2.at n=21A199336Sorted list of prime numbers in the union of 7-tuples (a,b,c,d,e,f,g) satisfying a^2 + b^2 + c^2 + d^2 + e^2 + f^2 + g^2 = a*b*c*d*e*f*g.at n=34A339062