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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.

A168130 Numbers Sum_(j=1..k) sigma(j) when Sum_(j=1..k) sigma(j) / sigma(k) is an integer.

Table of values

n a(n)
1 1
2 8
3 690
4 109668
5 1235133
6 5475784320
7 6118230000
8 28361961000
9 279467858880
10 107135567314230
11 227917248343616414016
12 79758963630439261338240
13 413838290195487519174516
14 638755027963568013738240

List of values

[1, 8, 690, 109668, 1235133, 5475784320, 6118230000, 28361961000, 279467858880, 107135567314230, 227917248343616414016, 79758963630439261338240, 413838290195487519174516, 638755027963568013738240]

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

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