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.

A063515 Sum of divisors of Woodall (or Riesel) numbers; sigma(A003261(n)); sigma(n*2^n - 1).

Table of values

n a(n)
1 1
2 8
3 24
4 104
5 216
6 384
7 1080
8 2160
9 4896
10 13656
11 32552
12 51312
13 137160
14 287408
15 573600
16 1999872
17 3034368
18 4778400
19 11098080
20 20984560
21 49533120
22 137218560
23 294000768
24 417361152
25 958698064
26 1755253280
27 4362821232
28 10552800000

List of values

[1, 8, 24, 104, 216, 384, 1080, 2160, 4896, 13656, 32552, 51312, 137160, 287408, 573600, 1999872, 3034368, 4778400, 11098080, 20984560, 49533120, 137218560, 294000768, 417361152, 958698064, 1755253280, 4362821232, 10552800000]

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

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