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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.

A276662 Iterative procedure in A316941 applied to the odd composite numbers (A071904) (a(n) = -1 if no prime is ever reached).

Table of values

n a(n)
1 311
2 1129
3 37
4 773
5 313
6 311
7 1129
8 313
9 3119014487
10 31079
11 317
12 773
13 1129
14 3110647
15 3103819425079
16 310397
17 5113
18 31079
19 3109
20 3137
21 310361
22 31259
23 331
24 36389
25 191176757654383
26 31063
27 337
28 523
29 324941
30 31393
31 127139
32 33769
33 31034567124791
34 32369
35 719
36 5623
37 347
38 3371
39 131777
40 349
41 31039
42 34412909

List of values

[311, 1129, 37, 773, 313, 311, 1129, 313, 3119014487, 31079, 317, 773, 1129, 3110647, 3103819425079, 310397, 5113, 31079, 3109, 3137, 310361, 31259, 331, 36389, 191176757654383, 31063, 337, 523, 324941, 31393, 127139, 33769, 31034567124791, 32369, 719, 5623, 347, 3371, 131777, 349, 31039, 34412909]

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

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