A111118 - cp's OEIS frontend

A111118 a(1) = 1; skipping over integers occurring earlier in the sequence, count down c(n) (c(n) = n-th composite) from a(n) to get a(n+1). If this is <= 0, instead count up from a(n) c(n) positions (skipping already occurring integers) to get a(n+1).

n	a(n)
1	1
2	5
3	11
4	2
5	13
6	23
7	9
8	26
9	7
10	28
11	3
12	31
13	52
14	29
15	55
16	25
17	57
18	22
19	59
20	19
21	62
22	17
23	64
24	15
25	66
26	10
27	68
28	6
29	71
30	115
31	69
32	117
33	63
34	119
35	60
36	121
37	56
38	124
39	53
40	126
41	50
42	128
43	47
44	131
45	45
46	133
47	43
48	135
49	40
50	137
51	38
52	140
53	35
54	142
55	33
56	144
57	30
58	147
59	24
60	149
61	18
62	151
63	14
64	153
65	8
66	156

[1, 5, 11, 2, 13, 23, 9, 26, 7, 28, 3, 31, 52, 29, 55, 25, 57, 22, 59, 19, 62, 17, 64, 15, 66, 10, 68, 6, 71, 115, 69, 117, 63, 119, 60, 121, 56, 124, 53, 126, 50, 128, 47, 131, 45, 133, 43, 135, 40, 137, 38, 140, 35, 142, 33, 144, 30, 147, 24, 149, 18, 151, 14, 153, 8, 156]

cp's OEIS Frontend

A111118 a(1) = 1; skipping over integers occurring earlier in the sequence, count down c(n) (c(n) = n-th composite) from a(n) to get a(n+1). If this is <= 0, instead count up from a(n) c(n) positions (skipping already occurring integers) to get a(n+1).

Table of values

List of values

n	a(n)
1	1
2	5
3	11
4	2
5	13
6	23
7	9
8	26
9	7
10	28
11	3
12	31
13	52
14	29
15	55
16	25
17	57
18	22
19	59
20	19
21	62
22	17
23	64
24	15
25	66
26	10
27	68
28	6
29	71
30	115
31	69
32	117
33	63
34	119
35	60
36	121
37	56
38	124
39	53
40	126
41	50
42	128
43	47
44	131
45	45
46	133
47	43
48	135
49	40
50	137
51	38
52	140
53	35
54	142
55	33
56	144
57	30
58	147
59	24
60	149
61	18
62	151
63	14
64	153
65	8
66	156

n	a(n)
1	1
2	5
3	11
4	2
5	13
6	23
7	9
8	26
9	7
10	28
11	3
12	31
13	52
14	29
15	55
16	25
17	57
18	22
19	59
20	19
21	62
22	17
23	64
24	15
25	66
26	10
27	68
28	6
29	71
30	115
31	69
32	117
33	63
34	119
35	60
36	121
37	56
38	124
39	53
40	126
41	50
42	128
43	47
44	131
45	45
46	133
47	43
48	135
49	40
50	137
51	38
52	140
53	35
54	142
55	33
56	144
57	30
58	147
59	24
60	149
61	18
62	151
63	14
64	153
65	8
66	156

n	a(n)
1	1
2	5
3	11
4	2
5	13
6	23
7	9
8	26
9	7
10	28
11	3
12	31
13	52
14	29
15	55
16	25
17	57
18	22
19	59
20	19
21	62
22	17
23	64
24	15
25	66
26	10
27	68
28	6
29	71
30	115
31	69
32	117
33	63
34	119
35	60
36	121
37	56
38	124
39	53
40	126
41	50
42	128
43	47
44	131
45	45
46	133
47	43
48	135
49	40
50	137
51	38
52	140
53	35
54	142
55	33
56	144
57	30
58	147
59	24
60	149
61	18
62	151
63	14
64	153
65	8
66	156