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.

A217755 Numbers n such that ((n^2 + n)/2)^2 + 1 is prime.

Table of values

n a(n)
1 1
2 3
3 4
4 8
5 11
6 15
7 20
8 24
9 28
10 31
11 39
12 43
13 48
14 64
15 75
16 76
17 79
18 80
19 111
20 116
21 120
22 135
23 148
24 155
25 160
26 168
27 179
28 184
29 200
30 203
31 208
32 211
33 216
34 223
35 224
36 235
37 243
38 251
39 263
40 264
41 288
42 303
43 319
44 320
45 324
46 348
47 351
48 356
49 364
50 371
51 375
52 388
53 416
54 419
55 420
56 424
57 428
58 439
59 443
60 451
61 456
62 459

List of values

[1, 3, 4, 8, 11, 15, 20, 24, 28, 31, 39, 43, 48, 64, 75, 76, 79, 80, 111, 116, 120, 135, 148, 155, 160, 168, 179, 184, 200, 203, 208, 211, 216, 223, 224, 235, 243, 251, 263, 264, 288, 303, 319, 320, 324, 348, 351, 356, 364, 371, 375, 388, 416, 419, 420, 424, 428, 439, 443, 451, 456, 459]

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

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