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.

A251757 Odd numbers n not congruent to 1 mod 6 and that are not perfect powers such that for all k >= 1 the numbers n*4^k - 1 are composite.

Table of values

n a(n)
1 39939
2 656709
3 762701
4 777149
5 779619
6 790841
7 869859
8 1106681
9 1156299
10 1254341
11 1320981
12 1330319
13 1730681
14 2251349
15 2344211
16 2882541
17 2924861
18 3079469
19 3292241
20 3419789
21 3580901
22 3661529
23 3781541
24 3784439
25 3848289
26 4358481
27 4384979
28 4507889
29 4524549

List of values

[39939, 656709, 762701, 777149, 779619, 790841, 869859, 1106681, 1156299, 1254341, 1320981, 1330319, 1730681, 2251349, 2344211, 2882541, 2924861, 3079469, 3292241, 3419789, 3580901, 3661529, 3781541, 3784439, 3848289, 4358481, 4384979, 4507889, 4524549]

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

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