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.

A283147 Number n such that there are no primes of the form sigma(n)/k where 1 < k < n is a (proper) nondivisor of n.

Table of values

n a(n)
1 1
2 2
3 4
4 9
5 12
6 16
7 25
8 48
9 64
10 112
11 192
12 240
13 289
14 448
15 729
16 960
17 1344
18 1681
19 1984
20 2401
21 3481
22 4096
23 5041
24 6720
25 7921
26 10201
27 12288
28 15625
29 17161
30 27889
31 28561
32 28672
33 29929
34 39270
35 53130
36 61440
37 65536
38 71610
39 82110

List of values

[1, 2, 4, 9, 12, 16, 25, 48, 64, 112, 192, 240, 289, 448, 729, 960, 1344, 1681, 1984, 2401, 3481, 4096, 5041, 6720, 7921, 10201, 12288, 15625, 17161, 27889, 28561, 28672, 29929, 39270, 53130, 61440, 65536, 71610, 82110]