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

A096097

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

Terms

    a(0) =2a(1) =1a(2) =3a(3) =71a(4) =7a(5) =10177a(6) =2100001a(7) =101770000001a(8) =4603a(9) =13a(10) =107a(11) =4013a(12) =23a(14) =1847a(15) =37a(16) =367767021959a(17) =54371a(18) =3229a(19) =17a(20) =520063a(21) =29a(22) =389a(23) =8059a(24) =732713a(25) =11a(26) =7123120001a(27) =137a(28) =294563a(30) =313583a(31) =4817

External references