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.

A002255 Numbers k such that 7*4^k + 1 is prime.

Table of values

n a(n)
1 1
2 2
3 3
4 7
5 10
6 13
7 25
8 26
9 46
10 60
11 87
12 90
13 95
14 145
15 160
16 195
17 216
18 308
19 415
20 902
21 1128
22 3307
23 6748
24 7747
25 8348
26 11193
27 27243
28 44033
29 47665
30 103542
31 141517
32 280908
33 402267
34 405615
35 745926
36 1069956
37 1083900
38 1457977
39 1507881
40 1755887

List of values

[1, 2, 3, 7, 10, 13, 25, 26, 46, 60, 87, 90, 95, 145, 160, 195, 216, 308, 415, 902, 1128, 3307, 6748, 7747, 8348, 11193, 27243, 44033, 47665, 103542, 141517, 280908, 402267, 405615, 745926, 1069956, 1083900, 1457977, 1507881, 1755887]

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

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