A323602 - cp's OEIS frontend

A323602 Smallest b > 1 not already in the sequence such that b^(c-1) == 1 (mod c), i.e., c is a base-b Fermat pseudoprime, where c is the n-th composite number (A002808).

n	a(n)
1	5
2	7
3	9
4	8
5	11
6	13
7	15
8	4
9	17
10	19
11	21
12	20
13	23
14	25
15	18
16	27
17	26
18	29
19	31
20	33
21	10
22	35
23	6
24	37
25	39
26	14
27	41
28	43
29	45
30	19
31	47
32	49
33	30
34	51
35	16
36	53
37	55
38	34
39	57
40	56
41	59
42	61
43	63
44	62
45	65
46	12
47	67
48	69
49	22
50	71
51	73
52	75
53	74
54	77
55	76
56	79
57	81
58	80
59	83
60	85
61	38
62	87
63	28
64	89
65	91
66	3
67	93

[5, 7, 9, 8, 11, 13, 15, 4, 17, 19, 21, 20, 23, 25, 18, 27, 26, 29, 31, 33, 10, 35, 6, 37, 39, 14, 41, 43, 45, 19, 47, 49, 30, 51, 16, 53, 55, 34, 57, 56, 59, 61, 63, 62, 65, 12, 67, 69, 22, 71, 73, 75, 74, 77, 76, 79, 81, 80, 83, 85, 38, 87, 28, 89, 91, 3, 93]

cp's OEIS Frontend

A323602 Smallest b > 1 not already in the sequence such that b^(c-1) == 1 (mod c), i.e., c is a base-b Fermat pseudoprime, where c is the n-th composite number (A002808).

Table of values

List of values

n	a(n)
1	5
2	7
3	9
4	8
5	11
6	13
7	15
8	4
9	17
10	19
11	21
12	20
13	23
14	25
15	18
16	27
17	26
18	29
19	31
20	33
21	10
22	35
23	6
24	37
25	39
26	14
27	41
28	43
29	45
30	19
31	47
32	49
33	30
34	51
35	16
36	53
37	55
38	34
39	57
40	56
41	59
42	61
43	63
44	62
45	65
46	12
47	67
48	69
49	22
50	71
51	73
52	75
53	74
54	77
55	76
56	79
57	81
58	80
59	83
60	85
61	38
62	87
63	28
64	89
65	91
66	3
67	93

n	a(n)
1	5
2	7
3	9
4	8
5	11
6	13
7	15
8	4
9	17
10	19
11	21
12	20
13	23
14	25
15	18
16	27
17	26
18	29
19	31
20	33
21	10
22	35
23	6
24	37
25	39
26	14
27	41
28	43
29	45
30	19
31	47
32	49
33	30
34	51
35	16
36	53
37	55
38	34
39	57
40	56
41	59
42	61
43	63
44	62
45	65
46	12
47	67
48	69
49	22
50	71
51	73
52	75
53	74
54	77
55	76
56	79
57	81
58	80
59	83
60	85
61	38
62	87
63	28
64	89
65	91
66	3
67	93

n	a(n)
1	5
2	7
3	9
4	8
5	11
6	13
7	15
8	4
9	17
10	19
11	21
12	20
13	23
14	25
15	18
16	27
17	26
18	29
19	31
20	33
21	10
22	35
23	6
24	37
25	39
26	14
27	41
28	43
29	45
30	19
31	47
32	49
33	30
34	51
35	16
36	53
37	55
38	34
39	57
40	56
41	59
42	61
43	63
44	62
45	65
46	12
47	67
48	69
49	22
50	71
51	73
52	75
53	74
54	77
55	76
56	79
57	81
58	80
59	83
60	85
61	38
62	87
63	28
64	89
65	91
66	3
67	93