A117817 - cp's OEIS frontend

A117817 Let T_n be the infinite sequence formed by starting with 1 and repeatedly reversing the digits and adding n to get the next term. If T_n eventually reaches a cycle, sequence gives length of that cycle, otherwise -1.

n	a(n)
1	9
2	81
3	3
4	54
5	207
6	30
7	63
8	27
9	1
10	-1
11	9
12	15
13	18
14	72
15	-1
16	90
17	54
18	13
19	18
20	-1
21	15
22	9
23	9
24	36
25	45
26	18
27	9
28	36
29	18
30	-1
31	9
32	9
33	3
34	36
35	72
36	2
37	27
38	18
39	3
40	-1
41	18
42	57
43	63
44	9
45	22
46	90
47	18
48	30
49	54
50	-1
51	6
52	99
53	54
54	13
55	36
56	207
57	12
58	63
59	45
60	-1
61	36
62	27
63	30
64	108
65	36
66	264
67	99
68	36
69	3
70	-1
71	18
72	22
73	45
74	90
75	12
76	45
77	117
78	192
79	18
80	-1
81	36
82	45
83	63
84	168
85	1008
86	36
87	24
88	306
89	9
90	-1
91	99
92	639
93	36
94	54
95	144
96	18
97	225
98	468
99	1
100	-1
101	18
102	300
103	189
104	171
105	765
106	90
107	45
108	462
109	90
110	-1
111	9
112	513
113	63
114	69

[9, 81, 3, 54, 207, 30, 63, 27, 1, -1, 9, 15, 18, 72, -1, 90, 54, 13, 18, -1, 15, 9, 9, 36, 45, 18, 9, 36, 18, -1, 9, 9, 3, 36, 72, 2, 27, 18, 3, -1, 18, 57, 63, 9, 22, 90, 18, 30, 54, -1, 6, 99, 54, 13, 36, 207, 12, 63, 45, -1, 36, 27, 30, 108, 36, 264, 99, 36, 3, -1, 18, 22, 45, 90, 12, 45, 117, 192, 18, -1, 36, 45, 63, 168, 1008, 36, 24, 306, 9, -1, 99, 639, 36, 54, 144, 18, 225, 468, 1, -1, 18, 300, 189, 171, 765, 90, 45, 462, 90, -1, 9, 513, 63, 69]

cp's OEIS Frontend

A117817 Let T_n be the infinite sequence formed by starting with 1 and repeatedly reversing the digits and adding n to get the next term. If T_n eventually reaches a cycle, sequence gives length of that cycle, otherwise -1.

Table of values

List of values