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.

A125237 Numbers n for which the absolute value of the abundance of both n and n^2 is a prime number.

Table of values

n a(n)
1 3
2 9
3 10
4 18
5 50
6 100
7 104
8 121
9 136
10 289
11 464
12 576
13 650
14 900
15 5041
16 6962
17 7225
18 10201
19 14400
20 55225
21 65025
22 87025
23 102152
24 147456
25 171698
26 174050
27 179776
28 182329
29 189225
30 201601
31 222784
32 291848
33 312481
34 380689
35 410881
36 469225
37 481636
38 488601

List of values

[3, 9, 10, 18, 50, 100, 104, 121, 136, 289, 464, 576, 650, 900, 5041, 6962, 7225, 10201, 14400, 55225, 65025, 87025, 102152, 147456, 171698, 174050, 179776, 182329, 189225, 201601, 222784, 291848, 312481, 380689, 410881, 469225, 481636, 488601]

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

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