A368940 - cp's OEIS frontend

A368940 Number of iterations before a repeated value, or -1 if this never occurs, when starting at k = 1 and repeating k = k*n if k does not contain any adjacent equal digits, else k = k with all adjacent equal digits replaced by a single copy of the same digit.

n	a(n)
1	1
2	86
3	338
4	816
5	2031
6	1570
7	2637
8	2392
9	4790
10	3
11	2
12	15199
13	21136
14	8124
15	12360
16	18210
17	101998
18	41798
19	15250
20	135
21	40063
22	27298
23	176470
24	6553
25	15757
26	5031
27	187645
28	24050
29	567055
30	487
31	141008
32	71243
33	341907
34	154758
35	38175
36	150429
37	84011
38	106833
39	351884
40	1117
41	391266
42	324631
43	1287699
44	374743

[1, 86, 338, 816, 2031, 1570, 2637, 2392, 4790, 3, 2, 15199, 21136, 8124, 12360, 18210, 101998, 41798, 15250, 135, 40063, 27298, 176470, 6553, 15757, 5031, 187645, 24050, 567055, 487, 141008, 71243, 341907, 154758, 38175, 150429, 84011, 106833, 351884, 1117, 391266, 324631, 1287699, 374743]

cp's OEIS Frontend

A368940 Number of iterations before a repeated value, or -1 if this never occurs, when starting at k = 1 and repeating k = k*n if k does not contain any adjacent equal digits, else k = k with all adjacent equal digits replaced by a single copy of the same digit.

Table of values

List of values