a(n) is the least k such that gcd(A006666(k), A006667(k)) = n.

Terms

a(0) =2a(1) =4a(2) =8a(3) =16a(4) =32a(5) =64a(6) =128a(7) =256a(8) =512a(9) =82a(10) =129a(11) =4096a(12) =327a(13) =16384a(14) =32768a(15) =1249a(16) =35655a(17) =159a(18) =4926a(19) =283a(20) =377a(21) =502a(22) =603a(23) =799a(24) =1063a(25) =1417a(26) =1889a(27) =2518a(28) =3356a(29) =4472