A268839 - cp's OEIS frontend

A268839 a(n) = Sum_{j=1..10^n-1} 2^f(j) where f(j) is the number of zero digits in the decimal representation of j.

n	a(n)
1	9
2	108
3	1197
4	13176
5	144945
6	1594404
7	17538453
8	192922992
9	2122152921
10	23343682140
11	256780503549
12	2824585539048
13	31070440929537
14	341774850224916
15	3759523352474085
16	41354756877214944
17	454902325649364393
18	5003925582143008332
19	55043181403573091661

[9, 108, 1197, 13176, 144945, 1594404, 17538453, 192922992, 2122152921, 23343682140, 256780503549, 2824585539048, 31070440929537, 341774850224916, 3759523352474085, 41354756877214944, 454902325649364393, 5003925582143008332, 55043181403573091661]

cp's OEIS Frontend

A268839 a(n) = Sum_{j=1..10^n-1} 2^f(j) where f(j) is the number of zero digits in the decimal representation of j.

Table of values

List of values