A039639 - cp's OEIS frontend

A039639 Fixed point of "k -> k/2 or (k-1)/2 until result is prime", starting with prime(n)+1.

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	2
8	5
9	3
10	7
11	2
12	19
13	5
14	11
15	3
16	13
17	7
18	31
19	17
20	2
21	37
22	5
23	5
24	11
25	3
26	3
27	13
28	13
29	13
30	7
31	2
32	2
33	17
34	17
35	37
36	19
37	79
38	41
39	5
40	43
41	11
42	11
43	3
44	97
45	3
46	3
47	53
48	7
49	7
50	7
51	29
52	7
53	7
54	31
55	2
56	2
57	67
58	17
59	139
60	17
61	71
62	73
63	19
64	19
65	157
66	79
67	83
68	5
69	43
70	43
71	11
72	11
73	23
74	23
75	47
76	3
77	97
78	199
79	3

[3, 2, 3, 2, 3, 7, 2, 5, 3, 7, 2, 19, 5, 11, 3, 13, 7, 31, 17, 2, 37, 5, 5, 11, 3, 3, 13, 13, 13, 7, 2, 2, 17, 17, 37, 19, 79, 41, 5, 43, 11, 11, 3, 97, 3, 3, 53, 7, 7, 7, 29, 7, 7, 31, 2, 2, 67, 17, 139, 17, 71, 73, 19, 19, 157, 79, 83, 5, 43, 43, 11, 11, 23, 23, 47, 3, 97, 199, 3]

cp's OEIS Frontend

A039639 Fixed point of "k -> k/2 or (k-1)/2 until result is prime", starting with prime(n)+1.

Table of values

List of values

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	2
8	5
9	3
10	7
11	2
12	19
13	5
14	11
15	3
16	13
17	7
18	31
19	17
20	2
21	37
22	5
23	5
24	11
25	3
26	3
27	13
28	13
29	13
30	7
31	2
32	2
33	17
34	17
35	37
36	19
37	79
38	41
39	5
40	43
41	11
42	11
43	3
44	97
45	3
46	3
47	53
48	7
49	7
50	7
51	29
52	7
53	7
54	31
55	2
56	2
57	67
58	17
59	139
60	17
61	71
62	73
63	19
64	19
65	157
66	79
67	83
68	5
69	43
70	43
71	11
72	11
73	23
74	23
75	47
76	3
77	97
78	199
79	3

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	2
8	5
9	3
10	7
11	2
12	19
13	5
14	11
15	3
16	13
17	7
18	31
19	17
20	2
21	37
22	5
23	5
24	11
25	3
26	3
27	13
28	13
29	13
30	7
31	2
32	2
33	17
34	17
35	37
36	19
37	79
38	41
39	5
40	43
41	11
42	11
43	3
44	97
45	3
46	3
47	53
48	7
49	7
50	7
51	29
52	7
53	7
54	31
55	2
56	2
57	67
58	17
59	139
60	17
61	71
62	73
63	19
64	19
65	157
66	79
67	83
68	5
69	43
70	43
71	11
72	11
73	23
74	23
75	47
76	3
77	97
78	199
79	3

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	2
8	5
9	3
10	7
11	2
12	19
13	5
14	11
15	3
16	13
17	7
18	31
19	17
20	2
21	37
22	5
23	5
24	11
25	3
26	3
27	13
28	13
29	13
30	7
31	2
32	2
33	17
34	17
35	37
36	19
37	79
38	41
39	5
40	43
41	11
42	11
43	3
44	97
45	3
46	3
47	53
48	7
49	7
50	7
51	29
52	7
53	7
54	31
55	2
56	2
57	67
58	17
59	139
60	17
61	71
62	73
63	19
64	19
65	157
66	79
67	83
68	5
69	43
70	43
71	11
72	11
73	23
74	23
75	47
76	3
77	97
78	199
79	3