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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.

A123907 a(n) = T(p(n)) - p(T(n)) = Commutator[triangular numbers, primes] at n.

Table of values

n a(n)
1 1
2 1
3 2
4 -1
5 19
6 18
7 46
8 39
9 79
10 178
11 179
12 306
13 394
14 375
15 469
16 662
17 887
18 872
19 1127
20 1265
21 1248
22 1553
23 1703
24 2018
25 2600
26 2780
27 2763
28 2987
29 2958
30 3134
31 4587
32 4849
33 5380
34 5373
35 6518
36 6503
37 7100
38 7725
39 8089
40 8750
41 9431
42 9452
43 10859
44 10892
45 11260
46 11219
47 13275
48 15485
49 15947
50 15908
51 16358
52 17257
53 17222
54 19189

List of values

[1, 1, 2, -1, 19, 18, 46, 39, 79, 178, 179, 306, 394, 375, 469, 662, 887, 872, 1127, 1265, 1248, 1553, 1703, 2018, 2600, 2780, 2763, 2987, 2958, 3134, 4587, 4849, 5380, 5373, 6518, 6503, 7100, 7725, 8089, 8750, 9431, 9452, 10859, 10892, 11260, 11219, 13275, 15485, 15947, 15908, 16358, 17257, 17222, 19189]

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

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