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.

A076488 Nonsquarefree solutions to gcd(sigma(x), phi(x)) = gcd(sigma(core(x)), Phi(core(x))), i.e., when A009223(x) = A066086(x) or if A066087(x)=0 and mu(x)=0.

Table of values

n a(n)
1 4
2 8
3 16
4 20
5 27
6 32
7 40
8 60
9 63
10 64
11 68
12 80
13 104
14 120
15 126
16 128
17 136
18 160
19 164
20 171
21 189
22 204
23 212
24 220
25 232
26 240
27 243
28 256
29 260
30 272
31 279
32 294
33 296
34 312
35 315
36 320
37 340
38 342
39 343
40 350
41 351
42 356
43 363
44 375
45 378
46 387
47 404
48 408
49 416
50 424
51 464
52 476
53 480
54 492
55 512

List of values

[4, 8, 16, 20, 27, 32, 40, 60, 63, 64, 68, 80, 104, 120, 126, 128, 136, 160, 164, 171, 189, 204, 212, 220, 232, 240, 243, 256, 260, 272, 279, 294, 296, 312, 315, 320, 340, 342, 343, 350, 351, 356, 363, 375, 378, 387, 404, 408, 416, 424, 464, 476, 480, 492, 512]

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

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