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.

A191581 Numbers whose sum of their anti-divisors divides the sum of their divisors.

Table of values

n a(n)
1 3
2 6
3 11
4 22
5 30
6 33
7 65
8 82
9 117
10 218
11 354
12 483
13 508
14 537
15 3276
16 6430
17 21541
18 117818
19 130356
20 753612
21 1007328
22 2113416
23 2379540
24 3589646
25 7231219
26 7346148
27 8515767
28 13050345
29 20199648
30 34424166
31 44575896
32 47245905
33 50414595
34 104335023
35 217728002
36 1217532421

List of values

[3, 6, 11, 22, 30, 33, 65, 82, 117, 218, 354, 483, 508, 537, 3276, 6430, 21541, 117818, 130356, 753612, 1007328, 2113416, 2379540, 3589646, 7231219, 7346148, 8515767, 13050345, 20199648, 34424166, 44575896, 47245905, 50414595, 104335023, 217728002, 1217532421]

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

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