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.

A239727 Numbers n such that the least prime of the form 2nk + 1 has a value of k that is larger than the k values for all smaller n.

Table of values

n a(n)
1 1
2 4
3 12
4 19
5 59
6 92
7 159
8 227
9 256
10 514
11 706
12 1466
13 5207
14 21209
15 62809
16 86914
17 152351
18 170167
19 321472
20 424783
21 491702
22 860831
23 1415551
24 1581442
25 2679809
26 4691576
27 6238447
28 6630812
29 17886697
30 27507569
31 30581429
32 57868997
33 108830332
34 116156102
35 127813579
36 154641337
37 1072567492
38 1101795593
39 3546087418
40 10371779744

List of values

[1, 4, 12, 19, 59, 92, 159, 227, 256, 514, 706, 1466, 5207, 21209, 62809, 86914, 152351, 170167, 321472, 424783, 491702, 860831, 1415551, 1581442, 2679809, 4691576, 6238447, 6630812, 17886697, 27507569, 30581429, 57868997, 108830332, 116156102, 127813579, 154641337, 1072567492, 1101795593, 3546087418, 10371779744]

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

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