A309387 - cp's OEIS frontend

A309387 a(n) is the smallest positive divisor not yet in the sequence of 7*A000217(n-1); n >= 1.

n	a(n)
1	1
2	7
3	3
4	2
5	5
6	15
7	21
8	4
9	6
10	9
11	11
12	14
13	13
14	49
15	35
16	8
17	17
18	51
19	19
20	10
21	30
22	33
23	23
24	12
25	20
26	25
27	27
28	18
29	29
30	87
31	31
32	16
33	22
34	77
35	85
36	42
37	37
38	133
39	39
40	26
41	28
42	41
43	43
44	86
45	45
46	63
47	47
48	24
49	56
50	175
51	75
52	34
53	53
54	159
55	55
56	44
57	38
58	57
59	59
60	70
61	61
62	217
63	93
64	32
65	40
66	65
67	67
68	119
69	46
70	69
71	71
72	36
73	73
74	259

[1, 7, 3, 2, 5, 15, 21, 4, 6, 9, 11, 14, 13, 49, 35, 8, 17, 51, 19, 10, 30, 33, 23, 12, 20, 25, 27, 18, 29, 87, 31, 16, 22, 77, 85, 42, 37, 133, 39, 26, 28, 41, 43, 86, 45, 63, 47, 24, 56, 175, 75, 34, 53, 159, 55, 44, 38, 57, 59, 70, 61, 217, 93, 32, 40, 65, 67, 119, 46, 69, 71, 36, 73, 259]

cp's OEIS Frontend

A309387 a(n) is the smallest positive divisor not yet in the sequence of 7*A000217(n-1); n >= 1.

Table of values

List of values

n	a(n)
1	1
2	7
3	3
4	2
5	5
6	15
7	21
8	4
9	6
10	9
11	11
12	14
13	13
14	49
15	35
16	8
17	17
18	51
19	19
20	10
21	30
22	33
23	23
24	12
25	20
26	25
27	27
28	18
29	29
30	87
31	31
32	16
33	22
34	77
35	85
36	42
37	37
38	133
39	39
40	26
41	28
42	41
43	43
44	86
45	45
46	63
47	47
48	24
49	56
50	175
51	75
52	34
53	53
54	159
55	55
56	44
57	38
58	57
59	59
60	70
61	61
62	217
63	93
64	32
65	40
66	65
67	67
68	119
69	46
70	69
71	71
72	36
73	73
74	259

n	a(n)
1	1
2	7
3	3
4	2
5	5
6	15
7	21
8	4
9	6
10	9
11	11
12	14
13	13
14	49
15	35
16	8
17	17
18	51
19	19
20	10
21	30
22	33
23	23
24	12
25	20
26	25
27	27
28	18
29	29
30	87
31	31
32	16
33	22
34	77
35	85
36	42
37	37
38	133
39	39
40	26
41	28
42	41
43	43
44	86
45	45
46	63
47	47
48	24
49	56
50	175
51	75
52	34
53	53
54	159
55	55
56	44
57	38
58	57
59	59
60	70
61	61
62	217
63	93
64	32
65	40
66	65
67	67
68	119
69	46
70	69
71	71
72	36
73	73
74	259

n	a(n)
1	1
2	7
3	3
4	2
5	5
6	15
7	21
8	4
9	6
10	9
11	11
12	14
13	13
14	49
15	35
16	8
17	17
18	51
19	19
20	10
21	30
22	33
23	23
24	12
25	20
26	25
27	27
28	18
29	29
30	87
31	31
32	16
33	22
34	77
35	85
36	42
37	37
38	133
39	39
40	26
41	28
42	41
43	43
44	86
45	45
46	63
47	47
48	24
49	56
50	175
51	75
52	34
53	53
54	159
55	55
56	44
57	38
58	57
59	59
60	70
61	61
62	217
63	93
64	32
65	40
66	65
67	67
68	119
69	46
70	69
71	71
72	36
73	73
74	259