A305924 - cp's OEIS frontend

A305924 Irregular table: row n >= 0 lists all k >= 0 such that the decimal representation of 4^k has n digits '0' (conjectured).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	7
6	8
7	9
8	12
9	14
10	16
11	17
12	18
13	36
14	38
15	43
16	5
17	6
18	10
19	11
20	13
21	15
22	19
23	20
24	22
25	23
26	24
27	25
28	29
29	33
30	34
31	37
32	42
33	48
34	61
35	62
36	65
37	92
38	21
39	26
40	27
41	28
42	30
43	31
44	32
45	39
46	40
47	41
48	46
49	54
50	58
51	68
52	74
53	75
54	77
55	35
56	45
57	56
58	57
59	64
60	66
61	67
62	70
63	71
64	78
65	82
66	83
67	87
68	88
69	47
70	53
71	59
72	63
73	85
74	89
75	91
76	93
77	98

[0, 1, 2, 3, 4, 7, 8, 9, 12, 14, 16, 17, 18, 36, 38, 43, 5, 6, 10, 11, 13, 15, 19, 20, 22, 23, 24, 25, 29, 33, 34, 37, 42, 48, 61, 62, 65, 92, 21, 26, 27, 28, 30, 31, 32, 39, 40, 41, 46, 54, 58, 68, 74, 75, 77, 35, 45, 56, 57, 64, 66, 67, 70, 71, 78, 82, 83, 87, 88, 47, 53, 59, 63, 85, 89, 91, 93, 98]

cp's OEIS Frontend

A305924 Irregular table: row n >= 0 lists all k >= 0 such that the decimal representation of 4^k has n digits '0' (conjectured).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	7
6	8
7	9
8	12
9	14
10	16
11	17
12	18
13	36
14	38
15	43
16	5
17	6
18	10
19	11
20	13
21	15
22	19
23	20
24	22
25	23
26	24
27	25
28	29
29	33
30	34
31	37
32	42
33	48
34	61
35	62
36	65
37	92
38	21
39	26
40	27
41	28
42	30
43	31
44	32
45	39
46	40
47	41
48	46
49	54
50	58
51	68
52	74
53	75
54	77
55	35
56	45
57	56
58	57
59	64
60	66
61	67
62	70
63	71
64	78
65	82
66	83
67	87
68	88
69	47
70	53
71	59
72	63
73	85
74	89
75	91
76	93
77	98

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	7
6	8
7	9
8	12
9	14
10	16
11	17
12	18
13	36
14	38
15	43
16	5
17	6
18	10
19	11
20	13
21	15
22	19
23	20
24	22
25	23
26	24
27	25
28	29
29	33
30	34
31	37
32	42
33	48
34	61
35	62
36	65
37	92
38	21
39	26
40	27
41	28
42	30
43	31
44	32
45	39
46	40
47	41
48	46
49	54
50	58
51	68
52	74
53	75
54	77
55	35
56	45
57	56
58	57
59	64
60	66
61	67
62	70
63	71
64	78
65	82
66	83
67	87
68	88
69	47
70	53
71	59
72	63
73	85
74	89
75	91
76	93
77	98

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	7
6	8
7	9
8	12
9	14
10	16
11	17
12	18
13	36
14	38
15	43
16	5
17	6
18	10
19	11
20	13
21	15
22	19
23	20
24	22
25	23
26	24
27	25
28	29
29	33
30	34
31	37
32	42
33	48
34	61
35	62
36	65
37	92
38	21
39	26
40	27
41	28
42	30
43	31
44	32
45	39
46	40
47	41
48	46
49	54
50	58
51	68
52	74
53	75
54	77
55	35
56	45
57	56
58	57
59	64
60	66
61	67
62	70
63	71
64	78
65	82
66	83
67	87
68	88
69	47
70	53
71	59
72	63
73	85
74	89
75	91
76	93
77	98