A100800 - cp's OEIS frontend

A100800 Let f(n) = n + sum of the digits of n. If f(n) is multiple of n then a(n)= f(n) else a(n) = f(f(f(n)))... until one gets a multiple of n; a(n) = 0 if no such number exists.

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	16
9	18
10	130
11	341
12	24
13	130
14	392
15	30
16	320
17	119
18	36
19	950
20	80
21	84
22	88
23	115
24	96
25	950
26	104
27	54
28	392
29	406
30	120
31	341
32	736
33	231
34	578
35	455
36	72
37	851
38	950
39	507
40	320
41	328
42	210
43	559
44	440
45	90
46	184
47	658
48	480
49	392
50	950
51	204
52	416
53	530
54	162
55	1430
56	2128
57	114

[2, 4, 6, 8, 10, 12, 14, 16, 18, 130, 341, 24, 130, 392, 30, 320, 119, 36, 950, 80, 84, 88, 115, 96, 950, 104, 54, 392, 406, 120, 341, 736, 231, 578, 455, 72, 851, 950, 507, 320, 328, 210, 559, 440, 90, 184, 658, 480, 392, 950, 204, 416, 530, 162, 1430, 2128, 114]

cp's OEIS Frontend

A100800 Let f(n) = n + sum of the digits of n. If f(n) is multiple of n then a(n)= f(n) else a(n) = f(f(f(n)))... until one gets a multiple of n; a(n) = 0 if no such number exists.

Table of values

List of values