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.

A063891 Numbers k such that nusigma(usigma(k)) = 2k, where usigma(k) is the sum of unitary divisors of k (A034448) and nusigma(k) is the sum of non-unitary divisors of k (A048146).

Table of values

n a(n)
1 1631
2 2016
3 8928
4 11808
5 36576
6 45360
7 1486080
8 2359008
9 3093552
10 37748448
11 101350656
12 150994656
13 2885670144

List of values

[1631, 2016, 8928, 11808, 36576, 45360, 1486080, 2359008, 3093552, 37748448, 101350656, 150994656, 2885670144]

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

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