cp's OEIS Frontend

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.

A307640 Least number k such that n divides gcd(sigma(k), phi(k), tau(k)).

Table of values

n a(n)
1 1
2 3
3 18
4 15
5 3344
6 45
7 24128
8 30
9 882
10 3344
11 1012736
12 126
13 1953792
14 24128
15 16200
16 168
17 452263936
18 2016
19 1852571648
20 3344
21 40768
22 1012736
23 27007123456
24 420
25 1490000
26 1953792
27 103968
28 24128
29 2739920699392
30 30096
31 8348342681600
32 840
33 9114624
34 452263936
35 6163776
36 2016

List of values

[1, 3, 18, 15, 3344, 45, 24128, 30, 882, 3344, 1012736, 126, 1953792, 24128, 16200, 168, 452263936, 2016, 1852571648, 3344, 40768, 1012736, 27007123456, 420, 1490000, 1953792, 103968, 24128, 2739920699392, 30096, 8348342681600, 840, 9114624, 452263936, 6163776, 2016]

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

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