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.

A376253 Composite numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2).

Table of values

n a(n)
1 4681
2 15841
3 42799
4 52633
5 220729
6 647089
7 951481
8 1082401
9 1145257
10 1969417
11 2215441
12 3567481
13 4835209
14 5049001
15 5681809
16 6140161
17 6334351
18 8725753
19 10712857
20 11777599
21 12327121
22 13500313
23 14709241
24 22564081
25 22849481
26 22953673
27 23828017
28 27271151
29 28758601
30 30576151

List of values

[4681, 15841, 42799, 52633, 220729, 647089, 951481, 1082401, 1145257, 1969417, 2215441, 3567481, 4835209, 5049001, 5681809, 6140161, 6334351, 8725753, 10712857, 11777599, 12327121, 13500313, 14709241, 22564081, 22849481, 22953673, 23828017, 27271151, 28758601, 30576151]

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

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