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.

A381507 Squarefree numbers k such that the sum of 1/(p-1) over the prime divisors p of k is 1.

Table of values

n a(n)
1 2
2 1365
3 73815
4 6702045
5 8788065
6 26241285
7 32426205
8 237539445
9 269409855
10 445317015
11 475231515
12 709296105
13 1085962395
14 1329722835
15 1447857915
16 2403281595
17 3255993615
18 5145721455
19 5254163355
20 5824953435
21 6560751435
22 7176232455
23 7703697855
24 8332635255
25 8542035645

List of values

[2, 1365, 73815, 6702045, 8788065, 26241285, 32426205, 237539445, 269409855, 445317015, 475231515, 709296105, 1085962395, 1329722835, 1447857915, 2403281595, 3255993615, 5145721455, 5254163355, 5824953435, 6560751435, 7176232455, 7703697855, 8332635255, 8542035645]