A387422 - cp's OEIS frontend

A387422 The length of the maximal common prefix of the binary expansions of n and sigma(n), where sigma is the sum of divisors function.

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

[1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 3, 4, 2, 4, 2, 2, 1, 2, 2, 1, 1, 5, 3, 1, 1, 1, 1, 1, 1, 2, 4, 1, 1, 3, 4, 1, 3, 3, 2, 2, 1, 2, 2, 1, 1, 3, 4, 2, 1, 3, 1, 1, 3, 1, 4, 2, 2, 1, 2, 3, 4, 1, 1, 3, 3, 1, 5, 1, 1, 3, 1, 2, 2, 3, 1, 1, 4, 1, 1, 2, 1, 5, 5, 1, 1, 3, 2, 2, 1, 2, 5, 1, 1, 3, 5, 3, 3, 6, 3]

cp's OEIS Frontend

A387422 The length of the maximal common prefix of the binary expansions of n and sigma(n), where sigma is the sum of divisors function.

Table of values

List of values

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

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

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