A039634 - cp's OEIS frontend

A039634 Fixed point of "n -> n/2 or (n-1)/2 until result is prime".

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

[1, 2, 3, 2, 5, 3, 7, 2, 2, 5, 11, 3, 13, 7, 7, 2, 17, 2, 19, 5, 5, 11, 23, 3, 3, 13, 13, 7, 29, 7, 31, 2, 2, 17, 17, 2, 37, 19, 19, 5, 41, 5, 43, 11, 11, 23, 47, 3, 3, 3, 3, 13, 53, 13, 13, 7, 7, 29, 59, 7, 61, 31, 31, 2, 2, 2, 67, 17, 17, 17, 71, 2, 73, 37, 37, 19, 19, 19, 79, 5, 5]

cp's OEIS Frontend

A039634 Fixed point of "n -> n/2 or (n-1)/2 until result is prime".

Table of values

List of values

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

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

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