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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.

A349666 Primes of the form 4*k+3 that are still a prime of the form 4*k+3 after 2 Collatz steps.

Table of values

n a(n)
1 7
2 31
3 47
4 71
5 127
6 151
7 167
8 239
9 311
10 431
11 439
12 479
13 607
14 631
15 647
16 727
17 839
18 911
19 967
20 991
21 1039
22 1231
23 1319
24 1399
25 1471
26 1511
27 1559
28 1567
29 1607
30 1879
31 1951
32 1999
33 2111
34 2239
35 2311
36 2351
37 2447
38 2671
39 2719
40 2927
41 3119
42 3167
43 3191
44 3359
45 3391
46 3671
47 3727
48 3767
49 3911

List of values

[7, 31, 47, 71, 127, 151, 167, 239, 311, 431, 439, 479, 607, 631, 647, 727, 839, 911, 967, 991, 1039, 1231, 1319, 1399, 1471, 1511, 1559, 1567, 1607, 1879, 1951, 1999, 2111, 2239, 2311, 2351, 2447, 2671, 2719, 2927, 3119, 3167, 3191, 3359, 3391, 3671, 3727, 3767, 3911]

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

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