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.

A003311 Write down the numbers from 3 to infinity. Take next number, M say, that has not been crossed off. Counting through the numbers that have not yet been crossed off after that M, cross off the first, (M+1)st, (2M+1)st, (3M+1)st, etc. Repeat. The numbers that are left form the sequence.

Table of values

n a(n)
1 3
2 5
3 8
4 11
5 15
6 18
7 23
8 27
9 32
10 38
11 42
12 47
13 53
14 57
15 63
16 71
17 75
18 78
19 90
20 93
21 98
22 105
23 113
24 117
25 123
26 132
27 137
28 140
29 147
30 161
31 165
32 168
33 176
34 183
35 188
36 197
37 206
38 212
39 215
40 227
41 233
42 237
43 243
44 252
45 258
46 267
47 278
48 282
49 287
50 293
51 303
52 312
53 317
54 323

List of values

[3, 5, 8, 11, 15, 18, 23, 27, 32, 38, 42, 47, 53, 57, 63, 71, 75, 78, 90, 93, 98, 105, 113, 117, 123, 132, 137, 140, 147, 161, 165, 168, 176, 183, 188, 197, 206, 212, 215, 227, 233, 237, 243, 252, 258, 267, 278, 282, 287, 293, 303, 312, 317, 323]

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

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