a(n) = gcd(2^n + 1, 3^n + 1).

Terms

a(0) =1a(1) =5a(2) =1a(3) =1a(4) =1a(5) =5a(6) =1a(7) =1a(8) =19a(9) =25a(10) =1a(11) =1a(12) =1a(13) =145a(14) =1a(15) =1a(16) =1a(17) =5a(18) =1a(19) =1a(20) =43a(21) =5a(22) =1a(23) =97a(24) =1a(25) =265a(26) =19a(27) =1a(28) =1a(29) =25