A090080 - cp's OEIS frontend

A090080 In binary expansion of n-th prime: reduce contiguous blocks of 0's to 0 and contiguous blocks of 1's to 1.

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

[2, 1, 5, 1, 5, 5, 5, 5, 5, 5, 1, 21, 21, 21, 5, 21, 5, 5, 5, 5, 21, 5, 21, 21, 5, 21, 5, 21, 21, 5, 1, 5, 21, 21, 85, 21, 21, 21, 21, 85, 21, 85, 5, 5, 21, 5, 21, 5, 5, 21, 21, 5, 5, 5, 5, 5, 21, 5, 85, 21, 21, 85, 21, 21, 21, 21, 85, 85, 85, 85, 21, 21, 21, 85, 21, 5, 21, 21, 21]

cp's OEIS Frontend

A090080 In binary expansion of n-th prime: reduce contiguous blocks of 0's to 0 and contiguous blocks of 1's to 1.

Table of values

List of values

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

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

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