a(1) = 1, a(n) = a(n-1)/n if a(n-1) is divisible by n else a(n) is the concatenation of a(n-1) and n.

A079791

a(1) = 1, a(n) = a(n-1)/n if a(n-1) is divisible by n else a(n) is the concatenation of a(n-1) and n.

Terms

    a(0) =1a(1) =12a(2) =4a(3) =1a(4) =15a(5) =156a(6) =1567a(7) =15678a(8) =1742a(9) =174210a(10) =17421011a(11) =1742101112a(12) =174210111213

External references