A131200 - cp's OEIS frontend

A131200 a(2n-1) = the smallest prime not occurring earlier in the sequence. a(2n) = the a(2n-1)th prime.

n	a(n)
1	2
2	3
3	5
4	11
5	7
6	17
7	13
8	41
9	19
10	67
11	23
12	83
13	29
14	109
15	31
16	127
17	37
18	157
19	43
20	191
21	47
22	211
23	53
24	241
25	59
26	277
27	61
28	283
29	71
30	353
31	73
32	367
33	79
34	401
35	89
36	461
37	97
38	509
39	101
40	547
41	103
42	563
43	107
44	587
45	113
46	617
47	131
48	739
49	137
50	773
51	139
52	797
53	149
54	859
55	151
56	877
57	163
58	967
59	167

[2, 3, 5, 11, 7, 17, 13, 41, 19, 67, 23, 83, 29, 109, 31, 127, 37, 157, 43, 191, 47, 211, 53, 241, 59, 277, 61, 283, 71, 353, 73, 367, 79, 401, 89, 461, 97, 509, 101, 547, 103, 563, 107, 587, 113, 617, 131, 739, 137, 773, 139, 797, 149, 859, 151, 877, 163, 967, 167]

cp's OEIS Frontend

A131200 a(2n-1) = the smallest prime not occurring earlier in the sequence. a(2n) = the a(2n-1)th prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	11
5	7
6	17
7	13
8	41
9	19
10	67
11	23
12	83
13	29
14	109
15	31
16	127
17	37
18	157
19	43
20	191
21	47
22	211
23	53
24	241
25	59
26	277
27	61
28	283
29	71
30	353
31	73
32	367
33	79
34	401
35	89
36	461
37	97
38	509
39	101
40	547
41	103
42	563
43	107
44	587
45	113
46	617
47	131
48	739
49	137
50	773
51	139
52	797
53	149
54	859
55	151
56	877
57	163
58	967
59	167

n	a(n)
1	2
2	3
3	5
4	11
5	7
6	17
7	13
8	41
9	19
10	67
11	23
12	83
13	29
14	109
15	31
16	127
17	37
18	157
19	43
20	191
21	47
22	211
23	53
24	241
25	59
26	277
27	61
28	283
29	71
30	353
31	73
32	367
33	79
34	401
35	89
36	461
37	97
38	509
39	101
40	547
41	103
42	563
43	107
44	587
45	113
46	617
47	131
48	739
49	137
50	773
51	139
52	797
53	149
54	859
55	151
56	877
57	163
58	967
59	167

n	a(n)
1	2
2	3
3	5
4	11
5	7
6	17
7	13
8	41
9	19
10	67
11	23
12	83
13	29
14	109
15	31
16	127
17	37
18	157
19	43
20	191
21	47
22	211
23	53
24	241
25	59
26	277
27	61
28	283
29	71
30	353
31	73
32	367
33	79
34	401
35	89
36	461
37	97
38	509
39	101
40	547
41	103
42	563
43	107
44	587
45	113
46	617
47	131
48	739
49	137
50	773
51	139
52	797
53	149
54	859
55	151
56	877
57	163
58	967
59	167