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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.

A069066 Sigma(n)+phi(n) is a triangular number.

Table of values

n a(n)
1 3
2 5
3 18
4 38
5 94
6 114
7 130
8 168
9 198
10 202
11 222
12 238
13 247
14 314
15 495
16 518
17 531
18 612
19 630
20 662
21 722
22 754
23 812
24 914
25 969
26 1007
27 1125
28 1138
29 1254
30 1258
31 1260
32 1313
33 1316
34 1558
35 1665
36 1736
37 1778
38 1794
39 1957
40 2110
41 2138
42 2233
43 2279
44 2327
45 2360
46 2364
47 2385
48 2474

List of values

[3, 5, 18, 38, 94, 114, 130, 168, 198, 202, 222, 238, 247, 314, 495, 518, 531, 612, 630, 662, 722, 754, 812, 914, 969, 1007, 1125, 1138, 1254, 1258, 1260, 1313, 1316, 1558, 1665, 1736, 1778, 1794, 1957, 2110, 2138, 2233, 2279, 2327, 2360, 2364, 2385, 2474]

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

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