Numbers X such that X^2 + Y^2 = 5^(2*k) + 1 and X > Y > 0 and k is the quintal digit length of X-1.

Terms

a(0) =5a(1) =25a(2) =115a(3) =125a(4) =551a(5) =625a(6) =2551a(7) =2885a(8) =3049a(9) =3125a(10) =15575a(11) =15625a(12) =72115a(13) =78125a(14) =303551a(15) =390625a(16) =1461799a(17) =1790635a(18) =1802885a(19) =1847551a(20) =1857449a(21) =1946801a(22) =1952875a(23) =1953125a(24) =8053505a(25) =8468945a(26) =9734425a(27) =9765625a(28) =36631645a(29) =43890449