a(1) = 2, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).
A062094
a(1) = 2, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).
Terms
- a(0) =2a(1) =12a(2) =34a(3) =217a(4) =731a(5) =1743a(6) =2183a(7) =3759a(8) =21179a(9) =121179a(10) =931303a(11) =1931303a(12) =11175573a(13) =11379829a(14) =17896361a(15) =18419721a(16) =96919009a(17) =889910891a(18) =1889910891a(19) =2742368917a(20) =25741106537a(21) =110203233579a(22) =679231622473
External references
- oeis: A062094