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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.

A332972 Solutions k of the equation cototient(k) = cototient(k-1) + cototient(k-2) where cototient(k) is A051953.

Table of values

n a(n)
1 3
2 4
3 105
4 165
5 195
6 2205
7 2835
8 38805
9 131145
10 407925
11 936495
12 1025505
13 1231425
14 1276905
15 1788255
16 1925565
17 2521695
18 2792145
19 2847585
20 3289935
21 5003745
22 5295885
23 5710089
24 6315309
25 6986889
26 13496385
27 17168085
28 19210065
29 20171385
30 22348365
31 26879685
32 27798705

List of values

[3, 4, 105, 165, 195, 2205, 2835, 38805, 131145, 407925, 936495, 1025505, 1231425, 1276905, 1788255, 1925565, 2521695, 2792145, 2847585, 3289935, 5003745, 5295885, 5710089, 6315309, 6986889, 13496385, 17168085, 19210065, 20171385, 22348365, 26879685, 27798705]

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

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