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.

A342555 2*a(n) is the start of 3 consecutive numbers (even-odd-even) that are sums of divisors, i.e., terms of A000203.

Table of values

n a(n)
1 3
2 6
3 15
4 19
5 63
6 153
7 199
8 255
9 423
10 480
11 511
12 546
13 861
14 1111
15 1189
16 1400
17 1770
18 1875
19 1935
20 1995
21 2047
22 2556
23 3475
24 3619
25 4005
26 4095
27 4920
28 5151
29 5215
30 6649
31 8046
32 8191
33 8646
34 8749
35 9765
36 11175
37 11199
38 14028
39 14197
40 15391
41 15427
42 15470
43 16383
44 19494
45 25878
46 26557
47 26799

List of values

[3, 6, 15, 19, 63, 153, 199, 255, 423, 480, 511, 546, 861, 1111, 1189, 1400, 1770, 1875, 1935, 1995, 2047, 2556, 3475, 3619, 4005, 4095, 4920, 5151, 5215, 6649, 8046, 8191, 8646, 8749, 9765, 11175, 11199, 14028, 14197, 15391, 15427, 15470, 16383, 19494, 25878, 26557, 26799]