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.

A339744 Numbers k such that rad(k)^2 < sigma(k), where rad(k) is the squarefree kernel of k (A007947) and sigma(k) is the sum of divisors of k (A000203).

Table of values

n a(n)
1 4
2 8
3 9
4 16
5 18
6 24
7 25
8 27
9 32
10 36
11 48
12 49
13 54
14 64
15 72
16 80
17 81
18 96
19 100
20 108
21 112
22 121
23 125
24 128
25 135
26 144
27 160
28 162
29 169
30 192
31 196
32 200
33 216
34 224
35 225
36 243
37 250
38 256
39 288
40 289
41 320
42 324
43 343
44 352
45 360
46 361
47 375
48 384
49 392
50 400
51 405
52 416
53 432
54 441
55 448
56 450
57 480
58 484
59 486
60 500

List of values

[4, 8, 9, 16, 18, 24, 25, 27, 32, 36, 48, 49, 54, 64, 72, 80, 81, 96, 100, 108, 112, 121, 125, 128, 135, 144, 160, 162, 169, 192, 196, 200, 216, 224, 225, 243, 250, 256, 288, 289, 320, 324, 343, 352, 360, 361, 375, 384, 392, 400, 405, 416, 432, 441, 448, 450, 480, 484, 486, 500]

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

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