A113285 - cp's OEIS frontend

A113285 Let S(n)=sigma(|n|)-2*n; sequence gives numbers n such that S(S(S(S(n))))=n. May be called {2,1}-Sociable number of orders 1 or 2 or 4.

n	a(n)
1	51
2	72
3	120
4	132
5	672
6	2602
7	4756
8	10054
9	14884
10	45840
11	51168
12	116252
13	523776
14	906202
15	3003698
16	5271836
17	65071776
18	77260656
19	82842816
20	89761152
21	138357404
22	139626548
23	459818240
24	985948800
25	1381340160
26	1476304896
27	1489384608
28	2183133696
29	3835877062

[51, 72, 120, 132, 672, 2602, 4756, 10054, 14884, 45840, 51168, 116252, 523776, 906202, 3003698, 5271836, 65071776, 77260656, 82842816, 89761152, 138357404, 139626548, 459818240, 985948800, 1381340160, 1476304896, 1489384608, 2183133696, 3835877062]

cp's OEIS Frontend

A113285 Let S(n)=sigma(|n|)-2*n; sequence gives numbers n such that S(S(S(S(n))))=n. May be called {2,1}-Sociable number of orders 1 or 2 or 4.

Table of values

List of values