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.

A109422 Numbers n such that tau(n)/bigomega(n) is not an integer [tau(n) =number of divisors of n; bigomega(n)=number of prime divisors of n, counted with multiplicities].

Table of values

n a(n)
1 4
2 8
3 9
4 16
5 25
6 27
7 30
8 32
9 36
10 42
11 49
12 64
13 66
14 70
15 72
16 78
17 81
18 100
19 102
20 105
21 108
22 110
23 114
24 120
25 121
26 125
27 128
28 130
29 138
30 144
31 154
32 165
33 168
34 169
35 170
36 174
37 180
38 182
39 186
40 190
41 195
42 196
43 200
44 216
45 222
46 225
47 230
48 231
49 238
50 240
51 243
52 246
53 252
54 255
55 256
56 258

List of values

[4, 8, 9, 16, 25, 27, 30, 32, 36, 42, 49, 64, 66, 70, 72, 78, 81, 100, 102, 105, 108, 110, 114, 120, 121, 125, 128, 130, 138, 144, 154, 165, 168, 169, 170, 174, 180, 182, 186, 190, 195, 196, 200, 216, 222, 225, 230, 231, 238, 240, 243, 246, 252, 255, 256, 258]

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

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