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.

A113791 Let S(n)=Sigma(n)/2. Numbers n such that S(S(n))=n, 1/2-Sociable number of order 1 or 2.

Table of values

n a(n)
1 6
2 12
3 14
4 28
5 48
6 62
7 112
8 124
9 160
10 189
11 192
12 254
13 448
14 496
15 508
16 1984
17 2032
18 8128
19 12288
20 16382
21 28672
22 32764
23 126976
24 131056
25 196608
26 262142
27 458752
28 520192
29 524224
30 524284
31 786432
32 1048574
33 1835008
34 2031616
35 2097136
36 2097148
37 8126464

List of values

[6, 12, 14, 28, 48, 62, 112, 124, 160, 189, 192, 254, 448, 496, 508, 1984, 2032, 8128, 12288, 16382, 28672, 32764, 126976, 131056, 196608, 262142, 458752, 520192, 524224, 524284, 786432, 1048574, 1835008, 2031616, 2097136, 2097148, 8126464]

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

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