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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.

A221856 Square numbers n for which sigma(n) + d(n) is also a perfect square.

Table of values

n a(n)
1 9
2 16
3 36
4 278784
5 251381025
6 2390623236
7 240055902025
8 354328515025
9 1022960302225
10 1298266542225
11 6824670333649
12 9433221536025
13 16614933604164
14 33314541015625
15 474897452948164
16 500279020818724
17 1387202986290276
18 2162188899431649
19 16053088159411524

List of values

[9, 16, 36, 278784, 251381025, 2390623236, 240055902025, 354328515025, 1022960302225, 1298266542225, 6824670333649, 9433221536025, 16614933604164, 33314541015625, 474897452948164, 500279020818724, 1387202986290276, 2162188899431649, 16053088159411524]

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

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