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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.

A102146 a(n) = sigma(10^n - 1), where sigma(n) is the sum of positive divisors of n.

Table of values

n a(n)
1 13
2 156
3 1520
4 15912
5 148512
6 2042880
7 14508000
8 162493344
9 1534205464
10 16203253248
11 144451398000
12 2063316971520
13 14903272088640
14 158269280832000
15 1614847741624320
16 17205180696931968
17 144444514193267496

List of values

[13, 156, 1520, 15912, 148512, 2042880, 14508000, 162493344, 1534205464, 16203253248, 144451398000, 2063316971520, 14903272088640, 158269280832000, 1614847741624320, 17205180696931968, 144444514193267496]

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

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