a(n) = numerator(N), where N = 0.123...n (concatenation of 1 to n after decimal point).

A078258

a(n) = numerator(N), where N = 0.123...n (concatenation of 1 to n after decimal point).

Terms

    a(0) =1a(1) =3a(2) =123a(3) =617a(4) =2469a(5) =1929a(6) =1234567a(7) =6172839a(8) =123456789a(9) =1234567891

External references