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.

A223136 Numbers n such that sigma(n+1) - sigma(n) = k*n for some integer k, where sigma(n) = A000203 (sum of divisors of n).

Table of values

n a(n)
1 1
2 3
3 7
4 14
5 31
6 127
7 206
8 532
9 954
10 957
11 1334
12 1364
13 1634
14 2685
15 2974
16 4364
17 8191
18 14841
19 18873
20 19358
21 20145
22 24957
23 33998
24 36566
25 42818
26 56564
27 64665
28 74918
29 79826
30 79833
31 84134
32 92685
33 104944
34 109214
35 111506
36 116937
37 122073
38 131071
39 138237
40 147454
41 161001

List of values

[1, 3, 7, 14, 31, 127, 206, 532, 954, 957, 1334, 1364, 1634, 2685, 2974, 4364, 8191, 14841, 18873, 19358, 20145, 24957, 33998, 36566, 42818, 56564, 64665, 74918, 79826, 79833, 84134, 92685, 104944, 109214, 111506, 116937, 122073, 131071, 138237, 147454, 161001]