a(1) = 1, a(2) = 2 and a(n) = smallest number not included earlier that divides the concatenation a(n-2), a(n-1).

A085946

a(1) = 1, a(2) = 2 and a(n) = smallest number not included earlier that divides the concatenation a(n-2), a(n-1).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =23a(4) =17a(5) =7a(6) =59a(7) =11a(8) =257a(9) =11257a(10) =13a(11) =1125713a(12) =43708571a(13) =19a(14) =9a(15) =199a(16) =9199a(17) =43a(18) =487a(19) =43487a(20) =39a(21) =228881a(22) =811a(23) =1973a(24) =41a(25) =197341a(26) =51a(27) =379a(28) =191a(29) =126397

External references