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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.

A215951 Numbers n such that the absolute value of the difference between the sum of the distinct prime divisors of n that are congruent to 1 mod 4 and the sum of the distinct prime divisors of n that are congruent to 3 mod 4 is a prime.

Table of values

n a(n)
1 15
2 30
3 35
4 45
5 60
6 70
7 75
8 90
9 105
10 120
11 135
12 140
13 143
14 150
15 175
16 180
17 210
18 225
19 240
20 245
21 255
22 270
23 273
24 280
25 285
26 286
27 300
28 315
29 323
30 350
31 357
32 360
33 375
34 385
35 405
36 420
37 435
38 450
39 455
40 465
41 480
42 490
43 510
44 525
45 540
46 546
47 560
48 561
49 570
50 572
51 600
52 609
53 615
54 630

List of values

[15, 30, 35, 45, 60, 70, 75, 90, 105, 120, 135, 140, 143, 150, 175, 180, 210, 225, 240, 245, 255, 270, 273, 280, 285, 286, 300, 315, 323, 350, 357, 360, 375, 385, 405, 420, 435, 450, 455, 465, 480, 490, 510, 525, 540, 546, 560, 561, 570, 572, 600, 609, 615, 630]

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

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