A084385 - cp's OEIS frontend

A084385 a(1) = 1; a(n+1) is the smallest number not occurring earlier and coprime to Sum_{j=1..n} a(j).

n	a(n)
1	1
2	2
3	4
4	3
5	7
6	5
7	9
8	6
9	8
10	11
11	13
12	10
13	12
14	15
15	17
16	14
17	16
18	19
19	21
20	18
21	20
22	23
23	25
24	22
25	24
26	27
27	29
28	26
29	28
30	31
31	33
32	30
33	32
34	35
35	37
36	34
37	36
38	39
39	41
40	38
41	40
42	43
43	45
44	42
45	44
46	47
47	49
48	46
49	48
50	51
51	53
52	50
53	52
54	55
55	57
56	54
57	56
58	59
59	61
60	58
61	60
62	63
63	65
64	62
65	64
66	67
67	69
68	66
69	68
70	71
71	73
72	70

[1, 2, 4, 3, 7, 5, 9, 6, 8, 11, 13, 10, 12, 15, 17, 14, 16, 19, 21, 18, 20, 23, 25, 22, 24, 27, 29, 26, 28, 31, 33, 30, 32, 35, 37, 34, 36, 39, 41, 38, 40, 43, 45, 42, 44, 47, 49, 46, 48, 51, 53, 50, 52, 55, 57, 54, 56, 59, 61, 58, 60, 63, 65, 62, 64, 67, 69, 66, 68, 71, 73, 70]

cp's OEIS Frontend

A084385 a(1) = 1; a(n+1) is the smallest number not occurring earlier and coprime to Sum_{j=1..n} a(j).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	7
6	5
7	9
8	6
9	8
10	11
11	13
12	10
13	12
14	15
15	17
16	14
17	16
18	19
19	21
20	18
21	20
22	23
23	25
24	22
25	24
26	27
27	29
28	26
29	28
30	31
31	33
32	30
33	32
34	35
35	37
36	34
37	36
38	39
39	41
40	38
41	40
42	43
43	45
44	42
45	44
46	47
47	49
48	46
49	48
50	51
51	53
52	50
53	52
54	55
55	57
56	54
57	56
58	59
59	61
60	58
61	60
62	63
63	65
64	62
65	64
66	67
67	69
68	66
69	68
70	71
71	73
72	70

n	a(n)
1	1
2	2
3	4
4	3
5	7
6	5
7	9
8	6
9	8
10	11
11	13
12	10
13	12
14	15
15	17
16	14
17	16
18	19
19	21
20	18
21	20
22	23
23	25
24	22
25	24
26	27
27	29
28	26
29	28
30	31
31	33
32	30
33	32
34	35
35	37
36	34
37	36
38	39
39	41
40	38
41	40
42	43
43	45
44	42
45	44
46	47
47	49
48	46
49	48
50	51
51	53
52	50
53	52
54	55
55	57
56	54
57	56
58	59
59	61
60	58
61	60
62	63
63	65
64	62
65	64
66	67
67	69
68	66
69	68
70	71
71	73
72	70

n	a(n)
1	1
2	2
3	4
4	3
5	7
6	5
7	9
8	6
9	8
10	11
11	13
12	10
13	12
14	15
15	17
16	14
17	16
18	19
19	21
20	18
21	20
22	23
23	25
24	22
25	24
26	27
27	29
28	26
29	28
30	31
31	33
32	30
33	32
34	35
35	37
36	34
37	36
38	39
39	41
40	38
41	40
42	43
43	45
44	42
45	44
46	47
47	49
48	46
49	48
50	51
51	53
52	50
53	52
54	55
55	57
56	54
57	56
58	59
59	61
60	58
61	60
62	63
63	65
64	62
65	64
66	67
67	69
68	66
69	68
70	71
71	73
72	70