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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.

A262481 Numbers m having in binary representation exactly lpf(m) ones, where lpf = least prime factor = A020639; a(1) = 1.

Table of values

n a(n)
1 1
2 6
3 10
4 12
5 18
6 20
7 21
8 24
9 34
10 36
11 40
12 48
13 55
14 66
15 68
16 69
17 72
18 80
19 81
20 96
21 115
22 130
23 132
24 136
25 144
26 155
27 160
28 185
29 192
30 205
31 258
32 260
33 261
34 264
35 272
36 273
37 288
38 295
39 320
40 321
41 355
42 384
43 395
44 425
45 514
46 516
47 520
48 528
49 535
50 544
51 565
52 576
53 595
54 623
55 625
56 637

List of values

[1, 6, 10, 12, 18, 20, 21, 24, 34, 36, 40, 48, 55, 66, 68, 69, 72, 80, 81, 96, 115, 130, 132, 136, 144, 155, 160, 185, 192, 205, 258, 260, 261, 264, 272, 273, 288, 295, 320, 321, 355, 384, 395, 425, 514, 516, 520, 528, 535, 544, 565, 576, 595, 623, 625, 637]

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

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