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.

A238225 Composite numbers n such that if x = sigma(n)-phi(n)-n then n = sigma(x)-phi(x)-x.

Table of values

n a(n)
1 12
2 42
3 1242
4 2010
5 2358
6 57990
7 65802
8 1782198
9 1890738
10 2504920
11 2733880
12 3286128
13 4181968
14 6137440
15 7861200
16 8233134
17 11208018
18 15228688
19 21445340
20 24563812
21 33714690
22 38928126
23 185154858
24 207494658
25 221604534
26 247017798
27 341398422
28 366777018

List of values

[12, 42, 1242, 2010, 2358, 57990, 65802, 1782198, 1890738, 2504920, 2733880, 3286128, 4181968, 6137440, 7861200, 8233134, 11208018, 15228688, 21445340, 24563812, 33714690, 38928126, 185154858, 207494658, 221604534, 247017798, 341398422, 366777018]

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

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