Values of x such that x^2 + y^2 = 13^n with x and y coprime and 0 < x < y.

Terms

a(0) =0a(1) =2a(2) =5a(3) =9a(4) =119a(5) =122a(6) =828a(7) =4449a(8) =239a(9) =56403a(10) =145668a(11) =246046a(12) =3369960a(13) =3627003a(14) =23161315a(15) =128629846a(16) =13651680a(17) =1590277918a(18) =4241902555a(19) =6712571031a(20) =95420159401a(21) =107655263398a(22) =647549275812a(24) =584824319281