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.

A259924 Numbers n such that sigma(n) - n = sum_{k divides n, k < n} k', where sigma(n) is the sum of the divisors of n and k' is the arithmetic derivative of k.

Table of values

n a(n)
1 1
2 780
3 1064
4 1289560
5 1428228
6 18107748
7 186000889725
8 680691912588

List of values

[1, 780, 1064, 1289560, 1428228, 18107748, 186000889725, 680691912588]