A030547 - cp's OEIS frontend

A030547 Number of terms (including the initial term) needed to reach a palindrome when the Reverse Then Add! map (x -> x + (x-with-digits-reversed)) is repeatedly applied to n, or -1 if a palindrome is never reached.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	2
11	1
12	2
13	2
14	2
15	2
16	2
17	2
18	2
19	3
20	2
21	2
22	1
23	2
24	2
25	2
26	2
27	2
28	3
29	2
30	2
31	2
32	2
33	1
34	2
35	2
36	2
37	3
38	2
39	3
40	2
41	2
42	2
43	2
44	1
45	2
46	3
47	2
48	3
49	3
50	2
51	2
52	2
53	2
54	2
55	1
56	2
57	3
58	3
59	4
60	2
61	2
62	2
63	2
64	3
65	2
66	1
67	3
68	4
69	5
70	2
71	2
72	2
73	3
74	2
75	3
76	3
77	1
78	5
79	7
80	2
81	2
82	3
83	2
84	3
85	3
86	4
87	5
88	1
89	25
90	2
91	3
92	2
93	3
94	3
95	4
96	5
97	7
98	25

[1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 1, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 1, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 1, 2, 3, 2, 3, 3, 2, 2, 2, 2, 2, 1, 2, 3, 3, 4, 2, 2, 2, 2, 3, 2, 1, 3, 4, 5, 2, 2, 2, 3, 2, 3, 3, 1, 5, 7, 2, 2, 3, 2, 3, 3, 4, 5, 1, 25, 2, 3, 2, 3, 3, 4, 5, 7, 25]

cp's OEIS Frontend

A030547 Number of terms (including the initial term) needed to reach a palindrome when the Reverse Then Add! map (x -> x + (x-with-digits-reversed)) is repeatedly applied to n, or -1 if a palindrome is never reached.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	2
11	1
12	2
13	2
14	2
15	2
16	2
17	2
18	2
19	3
20	2
21	2
22	1
23	2
24	2
25	2
26	2
27	2
28	3
29	2
30	2
31	2
32	2
33	1
34	2
35	2
36	2
37	3
38	2
39	3
40	2
41	2
42	2
43	2
44	1
45	2
46	3
47	2
48	3
49	3
50	2
51	2
52	2
53	2
54	2
55	1
56	2
57	3
58	3
59	4
60	2
61	2
62	2
63	2
64	3
65	2
66	1
67	3
68	4
69	5
70	2
71	2
72	2
73	3
74	2
75	3
76	3
77	1
78	5
79	7
80	2
81	2
82	3
83	2
84	3
85	3
86	4
87	5
88	1
89	25
90	2
91	3
92	2
93	3
94	3
95	4
96	5
97	7
98	25

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	2
11	1
12	2
13	2
14	2
15	2
16	2
17	2
18	2
19	3
20	2
21	2
22	1
23	2
24	2
25	2
26	2
27	2
28	3
29	2
30	2
31	2
32	2
33	1
34	2
35	2
36	2
37	3
38	2
39	3
40	2
41	2
42	2
43	2
44	1
45	2
46	3
47	2
48	3
49	3
50	2
51	2
52	2
53	2
54	2
55	1
56	2
57	3
58	3
59	4
60	2
61	2
62	2
63	2
64	3
65	2
66	1
67	3
68	4
69	5
70	2
71	2
72	2
73	3
74	2
75	3
76	3
77	1
78	5
79	7
80	2
81	2
82	3
83	2
84	3
85	3
86	4
87	5
88	1
89	25
90	2
91	3
92	2
93	3
94	3
95	4
96	5
97	7
98	25

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	2
11	1
12	2
13	2
14	2
15	2
16	2
17	2
18	2
19	3
20	2
21	2
22	1
23	2
24	2
25	2
26	2
27	2
28	3
29	2
30	2
31	2
32	2
33	1
34	2
35	2
36	2
37	3
38	2
39	3
40	2
41	2
42	2
43	2
44	1
45	2
46	3
47	2
48	3
49	3
50	2
51	2
52	2
53	2
54	2
55	1
56	2
57	3
58	3
59	4
60	2
61	2
62	2
63	2
64	3
65	2
66	1
67	3
68	4
69	5
70	2
71	2
72	2
73	3
74	2
75	3
76	3
77	1
78	5
79	7
80	2
81	2
82	3
83	2
84	3
85	3
86	4
87	5
88	1
89	25
90	2
91	3
92	2
93	3
94	3
95	4
96	5
97	7
98	25