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.

A248020 Numbers which are coprime to the sum of their divisors, but are neither primes nor perfect powers.

Table of values

n a(n)
1 21
2 35
3 39
4 50
5 55
6 57
7 63
8 65
9 75
10 77
11 85
12 93
13 98
14 111
15 115
16 119
17 129
18 133
19 143
20 155
21 161
22 171
23 175
24 183
25 185
26 187
27 189
28 201
29 203
30 205
31 209
32 215
33 217
34 219
35 221
36 235
37 237
38 242
39 245
40 247
41 253
42 259
43 265
44 275
45 279
46 291
47 299
48 301
49 305
50 309
51 319
52 323
53 325
54 327
55 329
56 333
57 335
58 338
59 341

List of values

[21, 35, 39, 50, 55, 57, 63, 65, 75, 77, 85, 93, 98, 111, 115, 119, 129, 133, 143, 155, 161, 171, 175, 183, 185, 187, 189, 201, 203, 205, 209, 215, 217, 219, 221, 235, 237, 242, 245, 247, 253, 259, 265, 275, 279, 291, 299, 301, 305, 309, 319, 323, 325, 327, 329, 333, 335, 338, 341]

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

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