a(n) = Sum_{ k = 0 to n-1} ( subtract k modulo 9 from 9, multiply this by k-th power of 10 ).
A133486
a(n) = Sum_{ k = 0 to n-1} ( subtract k modulo 9 from 9, multiply this by k-th power of 10 ).
Terms
- a(0) =9a(1) =89a(2) =789a(3) =6789a(4) =56789a(5) =456789a(6) =3456789a(7) =23456789a(8) =123456789a(9) =9123456789a(10) =89123456789a(11) =789123456789
External references
- oeis: A133486