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.

A337045 Indecomposable sigma-powerful numbers: powerful numbers k such that sigma(k) is also powerful, but restricted to terms that are not the product of 2 terms > 1 of A337044.

Table of values

n a(n)
1 81
2 343
3 400
4 9261
5 189728
6 224939
7 972000
8 1705636
9 2205472
10 3087000
11 3591200
12 3648100
13 7968032
14 13645088
15 15350724
16 21161304
17 24240600
18 25992000
19 26680500
20 29184800
21 32832900
22 48586824
23 51595489
24 80802000
25 103617387
26 109215352
27 110215125
28 119604096
29 122805792

List of values

[81, 343, 400, 9261, 189728, 224939, 972000, 1705636, 2205472, 3087000, 3591200, 3648100, 7968032, 13645088, 15350724, 21161304, 24240600, 25992000, 26680500, 29184800, 32832900, 48586824, 51595489, 80802000, 103617387, 109215352, 110215125, 119604096, 122805792]

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

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