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.

A295078 Numbers n > 1 such that n and sigma(n) have the same smallest and simultaneously largest prime factors.

Table of values

n a(n)
1 6
2 28
3 40
4 84
5 120
6 140
7 224
8 234
9 270
10 420
11 468
12 496
13 672
14 756
15 936
16 1080
17 1120
18 1170
19 1372
20 1488
21 1550
22 1638
23 1782
24 1862
25 2176
26 2340
27 2480
28 2574
29 3100
30 3250
31 3276
32 3360
33 3472
34 3564
35 3724
36 3744
37 3780
38 4116
39 4464
40 4598
41 4650
42 4680
43 5148
44 5456
45 5586
46 6048
47 6200

List of values

[6, 28, 40, 84, 120, 140, 224, 234, 270, 420, 468, 496, 672, 756, 936, 1080, 1120, 1170, 1372, 1488, 1550, 1638, 1782, 1862, 2176, 2340, 2480, 2574, 3100, 3250, 3276, 3360, 3472, 3564, 3724, 3744, 3780, 4116, 4464, 4598, 4650, 4680, 5148, 5456, 5586, 6048, 6200]

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

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