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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.

A074693 a(1) = 1, a(n) = a(n-1) + phi(a(n-1)).

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 9
6 15
7 23
8 45
9 69
10 113
11 225
12 345
13 521
14 1041
15 1733
16 3465
17 4905
18 7497
19 11529
20 18009
21 29097
22 47817
23 71577
24 114777
25 184761
26 307881
27 482841
28 804573
29 1212813
30 1854333
31 2993517
32 4953069
33 7752429
34 12826269
35 21376953
36 34207353
37 55027593
38 91712493
39 152705493

List of values

[1, 2, 3, 5, 9, 15, 23, 45, 69, 113, 225, 345, 521, 1041, 1733, 3465, 4905, 7497, 11529, 18009, 29097, 47817, 71577, 114777, 184761, 307881, 482841, 804573, 1212813, 1854333, 2993517, 4953069, 7752429, 12826269, 21376953, 34207353, 55027593, 91712493, 152705493]

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

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