A084335 - cp's OEIS frontend

A084335 a(1) = 1; a(n+1) is the least composite number m not already used such that |m-a(n)| is not equal to |a(k+1)-a(k)| for any k < n.

n	a(n)
1	4
2	6
3	9
4	8
5	12
6	18
7	10
8	15
9	22
10	32
11	14
12	25
13	16
14	28
15	42
16	20
17	33
18	48
19	21
20	38
21	54
22	24
23	44
24	63
25	26
26	49
27	70
28	27
29	51
30	76
31	30
32	56
33	84
34	34
35	65
36	36
37	68
38	35
39	69
40	104
41	39
42	75
43	114
44	40
45	78
46	118
47	45
48	86
49	128
50	46
51	90
52	135
53	50
54	98
55	145
56	52
57	105
58	154
59	55
60	106
61	158
62	57
63	111
64	166
65	58
66	115

[4, 6, 9, 8, 12, 18, 10, 15, 22, 32, 14, 25, 16, 28, 42, 20, 33, 48, 21, 38, 54, 24, 44, 63, 26, 49, 70, 27, 51, 76, 30, 56, 84, 34, 65, 36, 68, 35, 69, 104, 39, 75, 114, 40, 78, 118, 45, 86, 128, 46, 90, 135, 50, 98, 145, 52, 105, 154, 55, 106, 158, 57, 111, 166, 58, 115]

cp's OEIS Frontend

A084335 a(1) = 1; a(n+1) is the least composite number m not already used such that |m-a(n)| is not equal to |a(k+1)-a(k)| for any k < n.

Table of values

List of values

n	a(n)
1	4
2	6
3	9
4	8
5	12
6	18
7	10
8	15
9	22
10	32
11	14
12	25
13	16
14	28
15	42
16	20
17	33
18	48
19	21
20	38
21	54
22	24
23	44
24	63
25	26
26	49
27	70
28	27
29	51
30	76
31	30
32	56
33	84
34	34
35	65
36	36
37	68
38	35
39	69
40	104
41	39
42	75
43	114
44	40
45	78
46	118
47	45
48	86
49	128
50	46
51	90
52	135
53	50
54	98
55	145
56	52
57	105
58	154
59	55
60	106
61	158
62	57
63	111
64	166
65	58
66	115

n	a(n)
1	4
2	6
3	9
4	8
5	12
6	18
7	10
8	15
9	22
10	32
11	14
12	25
13	16
14	28
15	42
16	20
17	33
18	48
19	21
20	38
21	54
22	24
23	44
24	63
25	26
26	49
27	70
28	27
29	51
30	76
31	30
32	56
33	84
34	34
35	65
36	36
37	68
38	35
39	69
40	104
41	39
42	75
43	114
44	40
45	78
46	118
47	45
48	86
49	128
50	46
51	90
52	135
53	50
54	98
55	145
56	52
57	105
58	154
59	55
60	106
61	158
62	57
63	111
64	166
65	58
66	115

n	a(n)
1	4
2	6
3	9
4	8
5	12
6	18
7	10
8	15
9	22
10	32
11	14
12	25
13	16
14	28
15	42
16	20
17	33
18	48
19	21
20	38
21	54
22	24
23	44
24	63
25	26
26	49
27	70
28	27
29	51
30	76
31	30
32	56
33	84
34	34
35	65
36	36
37	68
38	35
39	69
40	104
41	39
42	75
43	114
44	40
45	78
46	118
47	45
48	86
49	128
50	46
51	90
52	135
53	50
54	98
55	145
56	52
57	105
58	154
59	55
60	106
61	158
62	57
63	111
64	166
65	58
66	115