A305928 - cp's OEIS frontend

A305928 Irregular table: row n >= 0 lists all k >= 0 such that the decimal representation of 8^k has n digits '0' (conjectured).

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	12
10	13
11	17
12	24
13	27
14	4
15	7
16	10
17	15
18	16
19	19
20	22
21	25
22	28
23	32
24	43
25	14
26	18
27	20
28	21
29	26
30	36
31	37
32	39
33	45
34	47
35	49
36	50
37	55
38	57
39	77
40	23
41	29
42	30
43	31
44	38
45	41
46	44
47	51
48	52
49	58
50	61
51	42
52	53
53	59
54	62
55	65
56	69
57	33
58	40
59	48
60	56
61	60
62	64
63	73
64	76
65	80
66	86
67	114
68	119
69	35
70	46

[0, 1, 2, 3, 5, 6, 8, 9, 11, 12, 13, 17, 24, 27, 4, 7, 10, 15, 16, 19, 22, 25, 28, 32, 43, 14, 18, 20, 21, 26, 36, 37, 39, 45, 47, 49, 50, 55, 57, 77, 23, 29, 30, 31, 38, 41, 44, 51, 52, 58, 61, 42, 53, 59, 62, 65, 69, 33, 40, 48, 56, 60, 64, 73, 76, 80, 86, 114, 119, 35, 46]

cp's OEIS Frontend

A305928 Irregular table: row n >= 0 lists all k >= 0 such that the decimal representation of 8^k has n digits '0' (conjectured).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	12
10	13
11	17
12	24
13	27
14	4
15	7
16	10
17	15
18	16
19	19
20	22
21	25
22	28
23	32
24	43
25	14
26	18
27	20
28	21
29	26
30	36
31	37
32	39
33	45
34	47
35	49
36	50
37	55
38	57
39	77
40	23
41	29
42	30
43	31
44	38
45	41
46	44
47	51
48	52
49	58
50	61
51	42
52	53
53	59
54	62
55	65
56	69
57	33
58	40
59	48
60	56
61	60
62	64
63	73
64	76
65	80
66	86
67	114
68	119
69	35
70	46

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	12
10	13
11	17
12	24
13	27
14	4
15	7
16	10
17	15
18	16
19	19
20	22
21	25
22	28
23	32
24	43
25	14
26	18
27	20
28	21
29	26
30	36
31	37
32	39
33	45
34	47
35	49
36	50
37	55
38	57
39	77
40	23
41	29
42	30
43	31
44	38
45	41
46	44
47	51
48	52
49	58
50	61
51	42
52	53
53	59
54	62
55	65
56	69
57	33
58	40
59	48
60	56
61	60
62	64
63	73
64	76
65	80
66	86
67	114
68	119
69	35
70	46

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	11
9	12
10	13
11	17
12	24
13	27
14	4
15	7
16	10
17	15
18	16
19	19
20	22
21	25
22	28
23	32
24	43
25	14
26	18
27	20
28	21
29	26
30	36
31	37
32	39
33	45
34	47
35	49
36	50
37	55
38	57
39	77
40	23
41	29
42	30
43	31
44	38
45	41
46	44
47	51
48	52
49	58
50	61
51	42
52	53
53	59
54	62
55	65
56	69
57	33
58	40
59	48
60	56
61	60
62	64
63	73
64	76
65	80
66	86
67	114
68	119
69	35
70	46