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.

A103968 Sigma((8^n - 1)/7), where sigma(n) is the sum of positive divisors of n.

Table of values

n a(n)
1 1
2 13
3 74
4 1092
5 4864
6 59200
7 346112
8 4756752
9 19436692
10 251916288
11 1294876800
12 20786304000
13 79541043200
14 1073030266880
15 5303003316224
16 81061789640832
17 324992122224640
18 4102172934143680
19 20588576135708672
20 376372958524932096

List of values

[1, 13, 74, 1092, 4864, 59200, 346112, 4756752, 19436692, 251916288, 1294876800, 20786304000, 79541043200, 1073030266880, 5303003316224, 81061789640832, 324992122224640, 4102172934143680, 20588576135708672, 376372958524932096]

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

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