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.

A218484 Square numbers n for which sigma(n) - d(n) is also a perfect square.

Table of values

n a(n)
1 1
2 4
3 1276900
4 7236100
5 9449476
6 69529779225
7 273137935876
8 275693254225
9 1011814692100
10 1590221881600
11 3007619594001
12 5382738725329
13 6343774129225
14 10830009646404
15 43037339281225
16 49597341481444
17 161977776248401
18 492275260674729
19 623724701219361

List of values

[1, 4, 1276900, 7236100, 9449476, 69529779225, 273137935876, 275693254225, 1011814692100, 1590221881600, 3007619594001, 5382738725329, 6343774129225, 10830009646404, 43037339281225, 49597341481444, 161977776248401, 492275260674729, 623724701219361]

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

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