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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.

A077103 Numbers n such that gcd(a,b) is not equal to gcd(a+b,a-b), where a=sigma(n)=A000203(n) and b=phi(n)=A000010(n).

Table of values

n a(n)
1 1
2 2
3 12
4 15
5 30
6 39
7 44
8 55
9 56
10 76
11 78
12 87
13 95
14 99
15 110
16 111
17 125
18 140
19 143
20 147
21 159
22 171
23 172
24 174
25 175
26 183
27 184
28 190
29 198
30 215
31 216
32 222
33 236
34 247
35 250
36 252
37 264
38 268
39 286
40 287
41 294
42 295
43 303
44 315
45 318
46 319
47 327
48 332
49 335
50 336
51 342
52 350
53 357
54 363
55 364

List of values

[1, 2, 12, 15, 30, 39, 44, 55, 56, 76, 78, 87, 95, 99, 110, 111, 125, 140, 143, 147, 159, 171, 172, 174, 175, 183, 184, 190, 198, 215, 216, 222, 236, 247, 250, 252, 264, 268, 286, 287, 294, 295, 303, 315, 318, 319, 327, 332, 335, 336, 342, 350, 357, 363, 364]

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

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