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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.

A115908 Numbers k such that phi(k) + prime(k) is a triangular number.

Table of values

n a(n)
1 1
2 5
3 6
4 15
5 23
6 141
7 150
8 258
9 317
10 340
11 359
12 378
13 471
14 503
15 768
16 1363
17 2175
18 2516
19 3285
20 3342
21 3815
22 3905
23 4385
24 4748
25 5385
26 5976
27 6026
28 6900
29 7048
30 7151
31 7411
32 7698
33 8251
34 8310
35 8828
36 10182
37 10461
38 12022
39 12508
40 13722
41 13840
42 15456
43 16582

List of values

[1, 5, 6, 15, 23, 141, 150, 258, 317, 340, 359, 378, 471, 503, 768, 1363, 2175, 2516, 3285, 3342, 3815, 3905, 4385, 4748, 5385, 5976, 6026, 6900, 7048, 7151, 7411, 7698, 8251, 8310, 8828, 10182, 10461, 12022, 12508, 13722, 13840, 15456, 16582]

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

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