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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.

A109797 First of a pair of compatible numbers, where two numbers m and n are compatible if sigma(n)-2dn=sigma(m)-2dm=m+n, for some proper divisors dn and dm of m and n respectively.

Table of values

n a(n)
1 24
2 30
3 40
4 42
5 48
6 60
7 80
8 80
9 96
10 102
11 126
12 140
13 140
14 156
15 156
16 156
17 174
18 180
19 180
20 198
21 216
22 224
23 224
24 264
25 276
26 280
27 294
28 294
29 300
30 320
31 340
32 372
33 380
34 384
35 440
36 440
37 468
38 500
39 504
40 510
41 528
42 560
43 582
44 608
45 616
46 642
47 680
48 684
49 690
50 690
51 696
52 702
53 736
54 750

List of values

[24, 30, 40, 42, 48, 60, 80, 80, 96, 102, 126, 140, 140, 156, 156, 156, 174, 180, 180, 198, 216, 224, 224, 264, 276, 280, 294, 294, 300, 320, 340, 372, 380, 384, 440, 440, 468, 500, 504, 510, 528, 560, 582, 608, 616, 642, 680, 684, 690, 690, 696, 702, 736, 750]

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

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