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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.

A270781 Numbers n with the property that n is both of the form p^2 + q^2 + r^2 + s^2 for some primes p, q, r, and s, and not of the form a^2 + b^2 + c^2 for any integers a, b, and c.

Table of values

n a(n)
1 31
2 47
3 63
4 71
5 79
6 87
7 92
8 103
9 111
10 124
11 127
12 143
13 151
14 156
15 159
16 175
17 183
18 188
19 191
20 199
21 207
22 220
23 223
24 231
25 247
26 252
27 255
28 271
29 295
30 303
31 311
32 316
33 319
34 327
35 343
36 348
37 351
38 367
39 383
40 391
41 399
42 412
43 415
44 423
45 439
46 444
47 463
48 471
49 476
50 487

List of values

[31, 47, 63, 71, 79, 87, 92, 103, 111, 124, 127, 143, 151, 156, 159, 175, 183, 188, 191, 199, 207, 220, 223, 231, 247, 252, 255, 271, 295, 303, 311, 316, 319, 327, 343, 348, 351, 367, 383, 391, 399, 412, 415, 423, 439, 444, 463, 471, 476, 487]

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

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