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.

A073815 Least number x such that gcd(phi(x), sigma(x)) = n.

Table of values

n a(n)
1 1
2 3
3 18
4 12
5 200
6 14
7 3364
8 15
9 722
10 328
11 9801
12 42
13 25281
14 116
15 1800
16 165
17 36992
18 810
19 4414201
20 88
21 196
22 29161
23 541696
24 35
25 2928200
26 1413
27 103968
28 172
29 98942809
30 488
31 1547536
32 336
33 19602
34 17536
35 814088
36 370
37 49042009
38 55297
39 1521
40 319
41 3150464641

List of values

[1, 3, 18, 12, 200, 14, 3364, 15, 722, 328, 9801, 42, 25281, 116, 1800, 165, 36992, 810, 4414201, 88, 196, 29161, 541696, 35, 2928200, 1413, 103968, 172, 98942809, 488, 1547536, 336, 19602, 17536, 814088, 370, 49042009, 55297, 1521, 319, 3150464641]

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

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