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.

A281575 Numbers k such that (d^2 + (k/d)^2)/2 is prime for all divisors d of k.

Table of values

n a(n)
1 3
2 5
3 11
4 15
5 19
6 29
7 35
8 39
9 51
10 59
11 61
12 65
13 69
14 71
15 79
16 85
17 95
18 101
19 131
20 139
21 141
22 145
23 159
24 181
25 199
26 205
27 209
28 221
29 231
30 271
31 299
32 309
33 329
34 349
35 371
36 379
37 391
38 409
39 415
40 449
41 461
42 471
43 519
44 521
45 535
46 545
47 559
48 569
49 571
50 581
51 631
52 641
53 649
54 661
55 685
56 689
57 739
58 745
59 751
60 779
61 799
62 815
63 821
64 861

List of values

[3, 5, 11, 15, 19, 29, 35, 39, 51, 59, 61, 65, 69, 71, 79, 85, 95, 101, 131, 139, 141, 145, 159, 181, 199, 205, 209, 221, 231, 271, 299, 309, 329, 349, 371, 379, 391, 409, 415, 449, 461, 471, 519, 521, 535, 545, 559, 569, 571, 581, 631, 641, 649, 661, 685, 689, 739, 745, 751, 779, 799, 815, 821, 861]

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

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