A039641 - cp's OEIS frontend

A039641 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	5
8	5
9	3
10	2
11	2
12	19
13	11
14	11
15	3
16	7
17	2
18	31
19	17
20	5
21	37
22	5
23	11
24	23
25	13
26	13
27	13
28	7
29	7
30	29
31	2
32	17
33	5
34	5
35	19
36	19
37	79
38	41
39	11
40	11
41	23
42	23
43	3
44	97
45	13
46	13
47	53
48	7
49	29
50	29
51	59
52	2
53	61
54	2
55	17
56	17
57	17
58	17
59	139
60	71
61	71
62	37
63	5
64	5
65	157
66	5
67	83
68	43
69	11
70	11
71	89
72	23
73	23
74	47
75	3
76	3
77	13

[3, 2, 3, 2, 3, 7, 5, 5, 3, 2, 2, 19, 11, 11, 3, 7, 2, 31, 17, 5, 37, 5, 11, 23, 13, 13, 13, 7, 7, 29, 2, 17, 5, 5, 19, 19, 79, 41, 11, 11, 23, 23, 3, 97, 13, 13, 53, 7, 29, 29, 59, 2, 61, 2, 17, 17, 17, 17, 139, 71, 71, 37, 5, 5, 157, 5, 83, 43, 11, 11, 89, 23, 23, 47, 3, 3, 13]

cp's OEIS Frontend

A039641 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	5
8	5
9	3
10	2
11	2
12	19
13	11
14	11
15	3
16	7
17	2
18	31
19	17
20	5
21	37
22	5
23	11
24	23
25	13
26	13
27	13
28	7
29	7
30	29
31	2
32	17
33	5
34	5
35	19
36	19
37	79
38	41
39	11
40	11
41	23
42	23
43	3
44	97
45	13
46	13
47	53
48	7
49	29
50	29
51	59
52	2
53	61
54	2
55	17
56	17
57	17
58	17
59	139
60	71
61	71
62	37
63	5
64	5
65	157
66	5
67	83
68	43
69	11
70	11
71	89
72	23
73	23
74	47
75	3
76	3
77	13

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	5
8	5
9	3
10	2
11	2
12	19
13	11
14	11
15	3
16	7
17	2
18	31
19	17
20	5
21	37
22	5
23	11
24	23
25	13
26	13
27	13
28	7
29	7
30	29
31	2
32	17
33	5
34	5
35	19
36	19
37	79
38	41
39	11
40	11
41	23
42	23
43	3
44	97
45	13
46	13
47	53
48	7
49	29
50	29
51	59
52	2
53	61
54	2
55	17
56	17
57	17
58	17
59	139
60	71
61	71
62	37
63	5
64	5
65	157
66	5
67	83
68	43
69	11
70	11
71	89
72	23
73	23
74	47
75	3
76	3
77	13

n	a(n)
1	3
2	2
3	3
4	2
5	3
6	7
7	5
8	5
9	3
10	2
11	2
12	19
13	11
14	11
15	3
16	7
17	2
18	31
19	17
20	5
21	37
22	5
23	11
24	23
25	13
26	13
27	13
28	7
29	7
30	29
31	2
32	17
33	5
34	5
35	19
36	19
37	79
38	41
39	11
40	11
41	23
42	23
43	3
44	97
45	13
46	13
47	53
48	7
49	29
50	29
51	59
52	2
53	61
54	2
55	17
56	17
57	17
58	17
59	139
60	71
61	71
62	37
63	5
64	5
65	157
66	5
67	83
68	43
69	11
70	11
71	89
72	23
73	23
74	47
75	3
76	3
77	13