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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.

A161757 a(n) = (prime(n))^2 - (nonprime(n))^2.

Table of values

n a(n)
1 4
2 8
3 9
4 13
5 57
6 88
7 189
8 217
9 333
10 616
11 705
12 1045
13 1281
14 1408
15 1725
16 2233
17 2856
18 3045
19 3760
20 4257
21 4429
22 5217
23 5800
24 6765
25 8184
26 8905
27 9165
28 9928
29 10281
30 11005
31 14193
32 15136
33 16653
34 17017
35 19800
36 20301
37 22048
38 23865
39 24973
40 26904
41 28905
42 29512
43 33117

List of values

[4, 8, 9, 13, 57, 88, 189, 217, 333, 616, 705, 1045, 1281, 1408, 1725, 2233, 2856, 3045, 3760, 4257, 4429, 5217, 5800, 6765, 8184, 8905, 9165, 9928, 10281, 11005, 14193, 15136, 16653, 17017, 19800, 20301, 22048, 23865, 24973, 26904, 28905, 29512, 33117]

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

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