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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.

A340799 a(n) is the smallest prime p such that p + 1 has 2n divisors.

Table of values

n a(n)
1 2
2 5
3 11
4 23
5 47
6 59
7 191
8 167
9 179
10 239
11 5119
12 359
13 20479
14 2111
15 719
16 839
17 1114111
18 1259
19 786431
20 3023
21 2879
22 15359
23 348127231
24 3359
25 22031
26 266239
27 6299
28 6719
29 22280142847
30 5039
31 559419490303
32 7559
33 156671
34 7798783
35 25919
36 10079
37 1168231104511
38 5505023

List of values

[2, 5, 11, 23, 47, 59, 191, 167, 179, 239, 5119, 359, 20479, 2111, 719, 839, 1114111, 1259, 786431, 3023, 2879, 15359, 348127231, 3359, 22031, 266239, 6299, 6719, 22280142847, 5039, 559419490303, 7559, 156671, 7798783, 25919, 10079, 1168231104511, 5505023]

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

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