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.

A370354 Composite numbers k that share a factor with sopfr(k), the sum of the primes dividing k, with repetition.

Table of values

n a(n)
1 4
2 8
3 9
4 16
5 18
6 24
7 25
8 27
9 30
10 32
11 36
12 42
13 49
14 50
15 60
16 64
17 66
18 70
19 72
20 78
21 81
22 84
23 98
24 100
25 102
26 105
27 110
28 114
29 120
30 121
31 125
32 126
33 128
34 130
35 132
36 138
37 140
38 144
39 150
40 154
41 156
42 160
43 162
44 168
45 169
46 170
47 174
48 180
49 182
50 186
51 190
52 192
53 195
54 196
55 200
56 204
57 216
58 220
59 222
60 228
61 230
62 231
63 234
64 238
65 240

List of values

[4, 8, 9, 16, 18, 24, 25, 27, 30, 32, 36, 42, 49, 50, 60, 64, 66, 70, 72, 78, 81, 84, 98, 100, 102, 105, 110, 114, 120, 121, 125, 126, 128, 130, 132, 138, 140, 144, 150, 154, 156, 160, 162, 168, 169, 170, 174, 180, 182, 186, 190, 192, 195, 196, 200, 204, 216, 220, 222, 228, 230, 231, 234, 238, 240]

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

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