A075685 - cp's OEIS frontend

A075685 Reverse and Add! carried out in base 4; number of steps needed to reach a palindrome, or -1 if no palindrome is ever reached.

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	1
10	0
11	1
12	1
13	2
14	1
15	0
16	1
17	0
18	1
19	2
20	1
21	0
22	1
23	2
24	2
25	0
26	3
27	2
28	4
29	0
30	4
31	3
32	1
33	1
34	0
35	1
36	1
37	1
38	0
39	4
40	2
41	3
42	0
43	2
44	3
45	4
46	0
47	4
48	1
49	2
50	1
51	0
52	1
53	2
54	4
55	0
56	3
57	2
58	2
59	0
60	4
61	3
62	4
63	0
64	1
65	0
66	1
67	2
68	1
69	1
70	1
71	2
72	1
73	1
74	1
75	3
76	1
77	1
78	1
79	2
80	1
81	1
82	1
83	2
84	1
85	0
86	1
87	3
88	1
89	1
90	1
91	2
92	2
93	3
94	3
95	2
96	1
97	1
98	1
99	3
100	1
101	1
102	1
103	2
104	2

[0, 0, 0, 0, 1, 0, 1, 2, 1, 1, 0, 1, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 2, 2, 0, 3, 2, 4, 0, 4, 3, 1, 1, 0, 1, 1, 1, 0, 4, 2, 3, 0, 2, 3, 4, 0, 4, 1, 2, 1, 0, 1, 2, 4, 0, 3, 2, 2, 0, 4, 3, 4, 0, 1, 0, 1, 2, 1, 1, 1, 2, 1, 1, 1, 3, 1, 1, 1, 2, 1, 1, 1, 2, 1, 0, 1, 3, 1, 1, 1, 2, 2, 3, 3, 2, 1, 1, 1, 3, 1, 1, 1, 2, 2]

cp's OEIS Frontend

A075685 Reverse and Add! carried out in base 4; number of steps needed to reach a palindrome, or -1 if no palindrome is ever reached.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	1
10	0
11	1
12	1
13	2
14	1
15	0
16	1
17	0
18	1
19	2
20	1
21	0
22	1
23	2
24	2
25	0
26	3
27	2
28	4
29	0
30	4
31	3
32	1
33	1
34	0
35	1
36	1
37	1
38	0
39	4
40	2
41	3
42	0
43	2
44	3
45	4
46	0
47	4
48	1
49	2
50	1
51	0
52	1
53	2
54	4
55	0
56	3
57	2
58	2
59	0
60	4
61	3
62	4
63	0
64	1
65	0
66	1
67	2
68	1
69	1
70	1
71	2
72	1
73	1
74	1
75	3
76	1
77	1
78	1
79	2
80	1
81	1
82	1
83	2
84	1
85	0
86	1
87	3
88	1
89	1
90	1
91	2
92	2
93	3
94	3
95	2
96	1
97	1
98	1
99	3
100	1
101	1
102	1
103	2
104	2

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	1
10	0
11	1
12	1
13	2
14	1
15	0
16	1
17	0
18	1
19	2
20	1
21	0
22	1
23	2
24	2
25	0
26	3
27	2
28	4
29	0
30	4
31	3
32	1
33	1
34	0
35	1
36	1
37	1
38	0
39	4
40	2
41	3
42	0
43	2
44	3
45	4
46	0
47	4
48	1
49	2
50	1
51	0
52	1
53	2
54	4
55	0
56	3
57	2
58	2
59	0
60	4
61	3
62	4
63	0
64	1
65	0
66	1
67	2
68	1
69	1
70	1
71	2
72	1
73	1
74	1
75	3
76	1
77	1
78	1
79	2
80	1
81	1
82	1
83	2
84	1
85	0
86	1
87	3
88	1
89	1
90	1
91	2
92	2
93	3
94	3
95	2
96	1
97	1
98	1
99	3
100	1
101	1
102	1
103	2
104	2

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	0
6	1
7	2
8	1
9	1
10	0
11	1
12	1
13	2
14	1
15	0
16	1
17	0
18	1
19	2
20	1
21	0
22	1
23	2
24	2
25	0
26	3
27	2
28	4
29	0
30	4
31	3
32	1
33	1
34	0
35	1
36	1
37	1
38	0
39	4
40	2
41	3
42	0
43	2
44	3
45	4
46	0
47	4
48	1
49	2
50	1
51	0
52	1
53	2
54	4
55	0
56	3
57	2
58	2
59	0
60	4
61	3
62	4
63	0
64	1
65	0
66	1
67	2
68	1
69	1
70	1
71	2
72	1
73	1
74	1
75	3
76	1
77	1
78	1
79	2
80	1
81	1
82	1
83	2
84	1
85	0
86	1
87	3
88	1
89	1
90	1
91	2
92	2
93	3
94	3
95	2
96	1
97	1
98	1
99	3
100	1
101	1
102	1
103	2
104	2