cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A153816 a(n) = Sum_{i=1..(10^n-1)/9} floor(((10^n-1)/9)/i).

Table of values

n a(n)
1 1
2 29
3 542
4 7967
5 105225
6 1308095
7 15639310
8 181976675
9 2075608136
10 23314508721
11 258729364359
12 2843136431305
13 30989792180446
14 335482200606705
15 3610664794156597
16 38665075822637767
17 412235037037411453
18 4378193158484415385
19 46340359465948601163

List of values

[1, 29, 542, 7967, 105225, 1308095, 15639310, 181976675, 2075608136, 23314508721, 258729364359, 2843136431305, 30989792180446, 335482200606705, 3610664794156597, 38665075822637767, 412235037037411453, 4378193158484415385, 46340359465948601163]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.