A329423 - cp's OEIS frontend

A329423 Each term is visited once according to the rule: go left (resp. right) a(n) places if a(n) is prime (resp. not prime), starting at a(1) = 1. Choose a(n) along this journey as the largest possible prime, or else the smallest possible composite, not occurring earlier and compatible with these rules.

n	a(n)
1	1
2	4
3	6
4	8
5	9
6	3
7	12
8	14
9	5
10	21
11	25
12	7
13	20
14	10
15	51
16	16
17	26
18	22
19	11
20	15
21	34
22	2
23	28
24	17
25	63
26	42
27	48
28	33
29	36
30	32
31	13
32	18
33	23
34	60
35	19
36	24
37	52
38	91
39	45
40	29
41	69
42	55
43	27
44	39
45	66
46	58
47	116
48	78
49	85
50	37
51	30
52	105
53	94
54	90
55	35
56	75
57	81
58	77
59	112
60	43
61	31
62	41
63	65
64	106
65	38
66	50
67	72
68	44
69	141
70	47
71	133
72	180
73	100
74	150
75	49
76	121
77	168
78	128
79	110

[1, 4, 6, 8, 9, 3, 12, 14, 5, 21, 25, 7, 20, 10, 51, 16, 26, 22, 11, 15, 34, 2, 28, 17, 63, 42, 48, 33, 36, 32, 13, 18, 23, 60, 19, 24, 52, 91, 45, 29, 69, 55, 27, 39, 66, 58, 116, 78, 85, 37, 30, 105, 94, 90, 35, 75, 81, 77, 112, 43, 31, 41, 65, 106, 38, 50, 72, 44, 141, 47, 133, 180, 100, 150, 49, 121, 168, 128, 110]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	8
5	9
6	3
7	12
8	14
9	5
10	21
11	25
12	7
13	20
14	10
15	51
16	16
17	26
18	22
19	11
20	15
21	34
22	2
23	28
24	17
25	63
26	42
27	48
28	33
29	36
30	32
31	13
32	18
33	23
34	60
35	19
36	24
37	52
38	91
39	45
40	29
41	69
42	55
43	27
44	39
45	66
46	58
47	116
48	78
49	85
50	37
51	30
52	105
53	94
54	90
55	35
56	75
57	81
58	77
59	112
60	43
61	31
62	41
63	65
64	106
65	38
66	50
67	72
68	44
69	141
70	47
71	133
72	180
73	100
74	150
75	49
76	121
77	168
78	128
79	110

n	a(n)
1	1
2	4
3	6
4	8
5	9
6	3
7	12
8	14
9	5
10	21
11	25
12	7
13	20
14	10
15	51
16	16
17	26
18	22
19	11
20	15
21	34
22	2
23	28
24	17
25	63
26	42
27	48
28	33
29	36
30	32
31	13
32	18
33	23
34	60
35	19
36	24
37	52
38	91
39	45
40	29
41	69
42	55
43	27
44	39
45	66
46	58
47	116
48	78
49	85
50	37
51	30
52	105
53	94
54	90
55	35
56	75
57	81
58	77
59	112
60	43
61	31
62	41
63	65
64	106
65	38
66	50
67	72
68	44
69	141
70	47
71	133
72	180
73	100
74	150
75	49
76	121
77	168
78	128
79	110

n	a(n)
1	1
2	4
3	6
4	8
5	9
6	3
7	12
8	14
9	5
10	21
11	25
12	7
13	20
14	10
15	51
16	16
17	26
18	22
19	11
20	15
21	34
22	2
23	28
24	17
25	63
26	42
27	48
28	33
29	36
30	32
31	13
32	18
33	23
34	60
35	19
36	24
37	52
38	91
39	45
40	29
41	69
42	55
43	27
44	39
45	66
46	58
47	116
48	78
49	85
50	37
51	30
52	105
53	94
54	90
55	35
56	75
57	81
58	77
59	112
60	43
61	31
62	41
63	65
64	106
65	38
66	50
67	72
68	44
69	141
70	47
71	133
72	180
73	100
74	150
75	49
76	121
77	168
78	128
79	110