a(1) = 1, a(2) = 2; for n >= 3, a(n) = least number not included earlier that divides the concatenation of all previous terms.

A240588

a(1) = 1, a(2) = 2; for n >= 3, a(n) = least number not included earlier that divides the concatenation of all previous terms.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =41a(4) =7a(5) =9a(6) =137131a(7) =61a(9) =13a(10) =19a(11) =11a(12) =143a(13) =142733a(14) =21a(15) =17a(16) =193a(17) =37a(18) =3907a(21) =3803623a(22) =123a(23) =369a(24) =27a(25) =23a(26) =58271a(27) =47609a(28) =523a(29) =79a(30) =307a(31) =179a(32) =73

External references