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.

A098186 If f[x]=(sum of unitary-proper divisors of x)=A063919[x] is iterated, the iteration may lead to a fixed point which is either 0 or belongs to A002827, a unitary-perfect-number >1: 6,60,90,87360... Sequence gives initial values for which the iteration ends in 87360, the 4th unitary perfect number.

Table of values

n a(n)
1 87360
2 232608
3 356640
4 465144
5 527712
6 565728
7 713208
8 1018248
9 1055352
10 1211352
11 1240032
12 1303728
13 1316904
14 1352568
15 1357584
16 1360416
17 1379280
18 1550472
19 1690440
20 1835592
21 2035608
22 2078328
23 2110632
24 2262892
25 2422632

List of values

[87360, 232608, 356640, 465144, 527712, 565728, 713208, 1018248, 1055352, 1211352, 1240032, 1303728, 1316904, 1352568, 1357584, 1360416, 1379280, 1550472, 1690440, 1835592, 2035608, 2078328, 2110632, 2262892, 2422632]

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

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