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.

A175334 a(n) is the smallest positive divisor of Product_{k=1..n} d(k) that does not yet occur in the sequence, where d(k) is the number of positive divisors of k.

Table of values

n a(n)
1 1
2 2
3 4
4 3
5 6
6 8
7 12
8 16
9 9
10 18
11 24
12 27
13 32
14 36
15 48
16 5
17 10
18 15
19 20
20 30
21 40
22 45
23 54
24 60
25 64
26 72
27 80
28 81
29 90
30 96
31 108
32 120
33 128
34 135
35 144
36 160
37 162
38 180
39 192
40 216
41 240
42 243
43 256
44 270
45 288
46 320
47 324
48 25
49 50
50 75
51 100
52 150
53 200
54 225
55 300
56 360
57 384
58 400
59 405
60 432
61 450
62 480

List of values

[1, 2, 4, 3, 6, 8, 12, 16, 9, 18, 24, 27, 32, 36, 48, 5, 10, 15, 20, 30, 40, 45, 54, 60, 64, 72, 80, 81, 90, 96, 108, 120, 128, 135, 144, 160, 162, 180, 192, 216, 240, 243, 256, 270, 288, 320, 324, 25, 50, 75, 100, 150, 200, 225, 300, 360, 384, 400, 405, 432, 450, 480]

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

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