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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.

A337560 Number of length four 1..n vectors that contain their harmonic mean.

Table of values

n a(n)
1 1
2 2
3 3
4 28
5 29
6 78
7 79
8 104
9 105
10 154
11 155
12 252
13 253
14 254
15 351
16 376
17 377
18 426
19 427
20 620
21 717
22 718
23 719
24 912
25 913
26 914
27 915
28 1084
29 1085
30 1374
31 1375
32 1400
33 1425
34 1426
35 1619
36 1812
37 1813
38 1814
39 1839
40 2128
41 2129
42 2442
43 2443
44 2564
45 2829
46 2830
47 2831
48 3192
49 3193

List of values

[1, 2, 3, 28, 29, 78, 79, 104, 105, 154, 155, 252, 253, 254, 351, 376, 377, 426, 427, 620, 717, 718, 719, 912, 913, 914, 915, 1084, 1085, 1374, 1375, 1400, 1425, 1426, 1619, 1812, 1813, 1814, 1839, 2128, 2129, 2442, 2443, 2564, 2829, 2830, 2831, 3192, 3193]

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

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