A237739 - cp's OEIS frontend

A237739 a(0) = 1, a(2n) = nthcomposite(a(n)-1), a(2n+1) = nthprime(a(n)), where nthcomposite = A002808, nthprime = A000040.

n	a(n)
0	1
1	2
2	4
3	3
4	8
5	7
6	6
7	5
8	14
9	19
10	12
11	17
12	10
13	13
14	9
15	11
16	22
17	43
18	28
19	67
20	20
21	37
22	26
23	59
24	16
25	29
26	21
27	41
28	15
29	23
30	18
31	31
32	33
33	79
34	60
35	191
36	40
37	107
38	91
39	331
40	30
41	71
42	52
43	157
44	38
45	101
46	81
47	277
48	25
49	53
50	42
51	109
52	32
53	73
54	57
55	179
56	24
57	47
58	34
59	83
60	27
61	61
62	45
63	127
64	48

[1, 2, 4, 3, 8, 7, 6, 5, 14, 19, 12, 17, 10, 13, 9, 11, 22, 43, 28, 67, 20, 37, 26, 59, 16, 29, 21, 41, 15, 23, 18, 31, 33, 79, 60, 191, 40, 107, 91, 331, 30, 71, 52, 157, 38, 101, 81, 277, 25, 53, 42, 109, 32, 73, 57, 179, 24, 47, 34, 83, 27, 61, 45, 127, 48]

cp's OEIS Frontend

A237739 a(0) = 1, a(2n) = nthcomposite(a(n)-1), a(2n+1) = nthprime(a(n)), where nthcomposite = A002808, nthprime = A000040.

Table of values

List of values

n	a(n)
0	1
1	2
2	4
3	3
4	8
5	7
6	6
7	5
8	14
9	19
10	12
11	17
12	10
13	13
14	9
15	11
16	22
17	43
18	28
19	67
20	20
21	37
22	26
23	59
24	16
25	29
26	21
27	41
28	15
29	23
30	18
31	31
32	33
33	79
34	60
35	191
36	40
37	107
38	91
39	331
40	30
41	71
42	52
43	157
44	38
45	101
46	81
47	277
48	25
49	53
50	42
51	109
52	32
53	73
54	57
55	179
56	24
57	47
58	34
59	83
60	27
61	61
62	45
63	127
64	48

n	a(n)
0	1
1	2
2	4
3	3
4	8
5	7
6	6
7	5
8	14
9	19
10	12
11	17
12	10
13	13
14	9
15	11
16	22
17	43
18	28
19	67
20	20
21	37
22	26
23	59
24	16
25	29
26	21
27	41
28	15
29	23
30	18
31	31
32	33
33	79
34	60
35	191
36	40
37	107
38	91
39	331
40	30
41	71
42	52
43	157
44	38
45	101
46	81
47	277
48	25
49	53
50	42
51	109
52	32
53	73
54	57
55	179
56	24
57	47
58	34
59	83
60	27
61	61
62	45
63	127
64	48

n	a(n)
0	1
1	2
2	4
3	3
4	8
5	7
6	6
7	5
8	14
9	19
10	12
11	17
12	10
13	13
14	9
15	11
16	22
17	43
18	28
19	67
20	20
21	37
22	26
23	59
24	16
25	29
26	21
27	41
28	15
29	23
30	18
31	31
32	33
33	79
34	60
35	191
36	40
37	107
38	91
39	331
40	30
41	71
42	52
43	157
44	38
45	101
46	81
47	277
48	25
49	53
50	42
51	109
52	32
53	73
54	57
55	179
56	24
57	47
58	34
59	83
60	27
61	61
62	45
63	127
64	48