A083275 - cp's OEIS frontend

A083275 a(n) = smallest number not occurring earlier such that a(1)a(2)...*a(n) - 1 is prime.

n	a(n)
1	3
2	1
3	2
4	4
5	7
6	5
7	6
8	11
9	12
10	10
11	13
12	17
13	14
14	16
15	15
16	8
17	18
18	23
19	21
20	26
21	22
22	27
23	41
24	30
25	20
26	57
27	32
28	29
29	24
30	65
31	42
32	38
33	28
34	63
35	35
36	19
37	58
38	31
39	36
40	61
41	45
42	37
43	33
44	69
45	53
46	67
47	127
48	40
49	95
50	25
51	86
52	48
53	39
54	72
55	70
56	79
57	54
58	74
59	91
60	125
61	85
62	94
63	46
64	9
65	80
66	60
67	119
68	167
69	139
70	90
71	49

[3, 1, 2, 4, 7, 5, 6, 11, 12, 10, 13, 17, 14, 16, 15, 8, 18, 23, 21, 26, 22, 27, 41, 30, 20, 57, 32, 29, 24, 65, 42, 38, 28, 63, 35, 19, 58, 31, 36, 61, 45, 37, 33, 69, 53, 67, 127, 40, 95, 25, 86, 48, 39, 72, 70, 79, 54, 74, 91, 125, 85, 94, 46, 9, 80, 60, 119, 167, 139, 90, 49]

cp's OEIS Frontend

A083275 a(n) = smallest number not occurring earlier such that a(1)a(2)...*a(n) - 1 is prime.

Table of values

List of values

n	a(n)
1	3
2	1
3	2
4	4
5	7
6	5
7	6
8	11
9	12
10	10
11	13
12	17
13	14
14	16
15	15
16	8
17	18
18	23
19	21
20	26
21	22
22	27
23	41
24	30
25	20
26	57
27	32
28	29
29	24
30	65
31	42
32	38
33	28
34	63
35	35
36	19
37	58
38	31
39	36
40	61
41	45
42	37
43	33
44	69
45	53
46	67
47	127
48	40
49	95
50	25
51	86
52	48
53	39
54	72
55	70
56	79
57	54
58	74
59	91
60	125
61	85
62	94
63	46
64	9
65	80
66	60
67	119
68	167
69	139
70	90
71	49

n	a(n)
1	3
2	1
3	2
4	4
5	7
6	5
7	6
8	11
9	12
10	10
11	13
12	17
13	14
14	16
15	15
16	8
17	18
18	23
19	21
20	26
21	22
22	27
23	41
24	30
25	20
26	57
27	32
28	29
29	24
30	65
31	42
32	38
33	28
34	63
35	35
36	19
37	58
38	31
39	36
40	61
41	45
42	37
43	33
44	69
45	53
46	67
47	127
48	40
49	95
50	25
51	86
52	48
53	39
54	72
55	70
56	79
57	54
58	74
59	91
60	125
61	85
62	94
63	46
64	9
65	80
66	60
67	119
68	167
69	139
70	90
71	49

cp's OEIS Frontend

A083275 a(n) = smallest number not occurring earlier such that a(1)*a(2)*...*a(n) - 1 is prime.

Table of values

List of values

A083275 a(n) = smallest number not occurring earlier such that a(1)a(2)...*a(n) - 1 is prime.

n	a(n)
1	3
2	1
3	2
4	4
5	7
6	5
7	6
8	11
9	12
10	10
11	13
12	17
13	14
14	16
15	15
16	8
17	18
18	23
19	21
20	26
21	22
22	27
23	41
24	30
25	20
26	57
27	32
28	29
29	24
30	65
31	42
32	38
33	28
34	63
35	35
36	19
37	58
38	31
39	36
40	61
41	45
42	37
43	33
44	69
45	53
46	67
47	127
48	40
49	95
50	25
51	86
52	48
53	39
54	72
55	70
56	79
57	54
58	74
59	91
60	125
61	85
62	94
63	46
64	9
65	80
66	60
67	119
68	167
69	139
70	90
71	49