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.

A351540 Numbers k that have an odd prime factor p such that p^(1+valuation(k,p)) divides sigma(k).

Table of values

n a(n)
1 30
2 51
3 66
4 96
5 102
6 120
7 138
8 159
9 165
10 174
11 204
12 210
13 213
14 246
15 255
16 264
17 267
18 282
19 294
20 306
21 318
22 321
23 330
24 345
25 354
26 357
27 364
28 390
29 408
30 426
31 435
32 462
33 477
34 480
35 498
36 510
37 534
38 537
39 552
40 561
41 570
42 591
43 606
44 615
45 636
46 642
47 660
48 663
49 672
50 678
51 679
52 690
53 696
54 699
55 705
56 714
57 735
58 745
59 750
60 753
61 759
62 760
63 765
64 786

List of values

[30, 51, 66, 96, 102, 120, 138, 159, 165, 174, 204, 210, 213, 246, 255, 264, 267, 282, 294, 306, 318, 321, 330, 345, 354, 357, 364, 390, 408, 426, 435, 462, 477, 480, 498, 510, 534, 537, 552, 561, 570, 591, 606, 615, 636, 642, 660, 663, 672, 678, 679, 690, 696, 699, 705, 714, 735, 745, 750, 753, 759, 760, 765, 786]

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

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