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.

A249486 Nonprime numbers n such that sigma(n) + n is prime.

Table of values

n a(n)
1 1
2 4
3 8
4 16
5 21
6 27
7 35
8 36
9 55
10 57
11 63
12 64
13 65
14 75
15 77
16 85
17 98
18 100
19 111
20 119
21 125
22 128
23 133
24 143
25 144
26 155
27 161
28 171
29 183
30 189
31 203
32 205
33 209
34 215
35 235
36 237
37 242
38 243
39 245
40 253
41 259
42 275
43 291
44 301
45 305
46 323
47 324
48 333
49 335
50 338
51 343
52 351
53 355
54 365
55 377
56 391

List of values

[1, 4, 8, 16, 21, 27, 35, 36, 55, 57, 63, 64, 65, 75, 77, 85, 98, 100, 111, 119, 125, 128, 133, 143, 144, 155, 161, 171, 183, 189, 203, 205, 209, 215, 235, 237, 242, 243, 245, 253, 259, 275, 291, 301, 305, 323, 324, 333, 335, 338, 343, 351, 355, 365, 377, 391]