A105432 - cp's OEIS frontend

A105432 Numbers n such that the near-repdigit number consisting of n-1 1's followed by a terminal 3 (i.e., of the form 111...1113) is composite.

n	a(n)
1	4
2	6
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	25
19	26
20	27
21	28
22	29
23	30
24	31
25	32
26	33
27	34
28	35
29	36
30	37
31	38
32	39
33	40
34	41
35	42
36	43
37	44
38	45
39	46
40	47
41	48
42	49
43	50
44	51
45	52
46	53
47	54
48	55
49	56
50	57
51	58
52	59
53	60
54	61
55	62
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	70
64	71
65	72
66	73
67	74
68	75
69	76
70	77
71	78

[4, 6, 7, 8, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78]

cp's OEIS Frontend

A105432 Numbers n such that the near-repdigit number consisting of n-1 1's followed by a terminal 3 (i.e., of the form 111...1113) is composite.

Table of values

List of values

n	a(n)
1	4
2	6
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	25
19	26
20	27
21	28
22	29
23	30
24	31
25	32
26	33
27	34
28	35
29	36
30	37
31	38
32	39
33	40
34	41
35	42
36	43
37	44
38	45
39	46
40	47
41	48
42	49
43	50
44	51
45	52
46	53
47	54
48	55
49	56
50	57
51	58
52	59
53	60
54	61
55	62
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	70
64	71
65	72
66	73
67	74
68	75
69	76
70	77
71	78

n	a(n)
1	4
2	6
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	25
19	26
20	27
21	28
22	29
23	30
24	31
25	32
26	33
27	34
28	35
29	36
30	37
31	38
32	39
33	40
34	41
35	42
36	43
37	44
38	45
39	46
40	47
41	48
42	49
43	50
44	51
45	52
46	53
47	54
48	55
49	56
50	57
51	58
52	59
53	60
54	61
55	62
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	70
64	71
65	72
66	73
67	74
68	75
69	76
70	77
71	78

n	a(n)
1	4
2	6
3	7
4	8
5	10
6	12
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	25
19	26
20	27
21	28
22	29
23	30
24	31
25	32
26	33
27	34
28	35
29	36
30	37
31	38
32	39
33	40
34	41
35	42
36	43
37	44
38	45
39	46
40	47
41	48
42	49
43	50
44	51
45	52
46	53
47	54
48	55
49	56
50	57
51	58
52	59
53	60
54	61
55	62
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	70
64	71
65	72
66	73
67	74
68	75
69	76
70	77
71	78