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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.

A333875 Numbers k such that both k and k+1 are squarefree and phi(k) = phi(k+1), where phi is the Euler totient function (A000010).

Table of values

n a(n)
1 1
2 194
3 3705
4 5186
5 25545
6 388245
7 1659585
8 2200694
9 2521694
10 2619705
11 3289934
12 3794834
13 4002405
14 5781434
15 6245546
16 6372794
17 8338394
18 12352934
19 14144954
20 16475414
21 22632285
22 23553705
23 37762394
24 40588485
25 43834754
26 44485454
27 59603954
28 63298785
29 76466985
30 81591194

List of values

[1, 194, 3705, 5186, 25545, 388245, 1659585, 2200694, 2521694, 2619705, 3289934, 3794834, 4002405, 5781434, 6245546, 6372794, 8338394, 12352934, 14144954, 16475414, 22632285, 23553705, 37762394, 40588485, 43834754, 44485454, 59603954, 63298785, 76466985, 81591194]

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

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