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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.

A195106 Numbers with largest and smallest prime factors differing by 4.

Table of values

n a(n)
1 21
2 63
3 77
4 105
5 147
6 189
7 221
8 315
9 437
10 441
11 525
12 539
13 567
14 735
15 847
16 945
17 1029
18 1323
19 1517
20 1575
21 1701
22 2021
23 2205
24 2625
25 2835
26 2873
27 3087
28 3675
29 3757
30 3773
31 3969
32 4725
33 4757
34 5103
35 5145
36 5929
37 6557
38 6615
39 7203
40 7875
41 8303
42 8505
43 9261
44 9317
45 9797
46 10051

List of values

[21, 63, 77, 105, 147, 189, 221, 315, 437, 441, 525, 539, 567, 735, 847, 945, 1029, 1323, 1517, 1575, 1701, 2021, 2205, 2625, 2835, 2873, 3087, 3675, 3757, 3773, 3969, 4725, 4757, 5103, 5145, 5929, 6557, 6615, 7203, 7875, 8303, 8505, 9261, 9317, 9797, 10051]

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

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