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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.

A100586 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 every 5th term. Repeat, always crossing off every 5th term of those that remain. The numbers that are left form the sequence.

Table of values

n a(n)
1 3
2 4
3 5
4 6
5 7
6 9
7 11
8 14
9 17
10 21
11 26
12 32
13 40
14 50
15 62
16 77
17 96
18 120
19 150
20 187
21 234
22 292
23 365
24 456
25 570
26 712
27 890
28 1112
29 1390
30 1737
31 2171
32 2714
33 3392
34 4240
35 5300
36 6625
37 8281
38 10351
39 12939
40 16174
41 20217
42 25271
43 31589
44 39486
45 49357
46 61696
47 77120

List of values

[3, 4, 5, 6, 7, 9, 11, 14, 17, 21, 26, 32, 40, 50, 62, 77, 96, 120, 150, 187, 234, 292, 365, 456, 570, 712, 890, 1112, 1390, 1737, 2171, 2714, 3392, 4240, 5300, 6625, 8281, 10351, 12939, 16174, 20217, 25271, 31589, 39486, 49357, 61696, 77120]

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

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