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.

A201998 Positive numbers n such that n^2 + n + 41 is composite and there are no positive integers c such that n = c*x^2 + (c + 1)*x + c*41 for an integer x.

Table of values

n a(n)
1 244
2 249
3 251
4 266
5 270
6 295
7 301
8 336
9 344
10 389
11 399
12 407
13 416
14 418
15 445
16 449
17 454
18 466
19 489
20 494
21 496
22 500
23 506
24 527
25 531
26 545
27 547
28 563
29 570
30 571
31 582
32 583
33 585
34 611
35 612
36 620
37 622
38 624
39 628
40 630
41 636
42 652
43 661
44 662
45 663
46 679
47 693
48 699

List of values

[244, 249, 251, 266, 270, 295, 301, 336, 344, 389, 399, 407, 416, 418, 445, 449, 454, 466, 489, 494, 496, 500, 506, 527, 531, 545, 547, 563, 570, 571, 582, 583, 585, 611, 612, 620, 622, 624, 628, 630, 636, 652, 661, 662, 663, 679, 693, 699]

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

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