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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.

A245199 Numbers n where phi(n) and tau(n) are perfect squares.

Table of values

n a(n)
1 1
2 8
3 10
4 34
5 57
6 74
7 85
8 125
9 185
10 202
11 219
12 394
13 451
14 456
15 489
16 505
17 514
18 546
19 570
20 629
21 640
22 679
23 680
24 802
25 985
26 1000
27 1026
28 1057
29 1154
30 1285
31 1354
32 1365
33 1387
34 1417
35 1480
36 1717
37 1752
38 1938
39 2005
40 2016
41 2047
42 2176
43 2190
44 2340
45 2457
46 2509
47 2565
48 2594
49 2649

List of values

[1, 8, 10, 34, 57, 74, 85, 125, 185, 202, 219, 394, 451, 456, 489, 505, 514, 546, 570, 629, 640, 679, 680, 802, 985, 1000, 1026, 1057, 1154, 1285, 1354, 1365, 1387, 1417, 1480, 1717, 1752, 1938, 2005, 2016, 2047, 2176, 2190, 2340, 2457, 2509, 2565, 2594, 2649]

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

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