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.

A272859 Numbers m such that sigma(Product(p_j)) = sigma(Product(e_j)), where m = Product((p_i)^e_i) and sigma = A000203.

Table of values

n a(n)
1 1
2 4
3 27
4 72
5 108
6 192
7 800
8 1458
9 3125
10 5120
11 6144
12 6272
13 10976
14 12500
15 21600
16 30375
17 36000
18 48600
19 54675
20 77760
21 84375
22 114688
23 116640
24 121500
25 134456
26 138240
27 169344
28 173056
29 225000
30 229376
31 247808
32 337500
33 354294
34 384000
35 395136
36 600000
37 653184
38 655360
39 703125
40 750141
41 823543
42 857304
43 913952
44 979776

List of values

[1, 4, 27, 72, 108, 192, 800, 1458, 3125, 5120, 6144, 6272, 10976, 12500, 21600, 30375, 36000, 48600, 54675, 77760, 84375, 114688, 116640, 121500, 134456, 138240, 169344, 173056, 225000, 229376, 247808, 337500, 354294, 384000, 395136, 600000, 653184, 655360, 703125, 750141, 823543, 857304, 913952, 979776]

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

Content is available under The OEIS End-User License Agreement.