A065718 - cp's OEIS frontend

A065718 Number of 7's in decimal expansion of 2^n.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	1
16	0
17	1
18	0
19	0
20	1
21	1
22	0
23	0
24	3
25	0
26	1
27	2
28	0
29	1
30	2
31	1
32	1
33	0
34	2
35	1
36	3
37	2
38	3
39	1
40	3
41	0
42	0
43	1
44	1
45	1
46	4
47	2
48	3
49	0
50	0
51	1
52	2
53	2
54	0
55	2
56	4
57	2
58	3
59	2
60	1
61	0
62	2
63	3
64	3
65	1
66	3
67	3
68	2
69	2
70	2
71	0
72	1
73	3
74	2
75	5
76	3
77	3
78	2
79	2
80	3
81	1
82	3
83	3
84	1
85	2
86	4
87	2
88	2
89	2
90	2
91	5
92	2
93	1
94	2
95	5
96	2
97	4
98	4
99	2
100	3

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 3, 0, 1, 2, 0, 1, 2, 1, 1, 0, 2, 1, 3, 2, 3, 1, 3, 0, 0, 1, 1, 1, 4, 2, 3, 0, 0, 1, 2, 2, 0, 2, 4, 2, 3, 2, 1, 0, 2, 3, 3, 1, 3, 3, 2, 2, 2, 0, 1, 3, 2, 5, 3, 3, 2, 2, 3, 1, 3, 3, 1, 2, 4, 2, 2, 2, 2, 5, 2, 1, 2, 5, 2, 4, 4, 2, 3]

cp's OEIS Frontend

A065718 Number of 7's in decimal expansion of 2^n.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	1
16	0
17	1
18	0
19	0
20	1
21	1
22	0
23	0
24	3
25	0
26	1
27	2
28	0
29	1
30	2
31	1
32	1
33	0
34	2
35	1
36	3
37	2
38	3
39	1
40	3
41	0
42	0
43	1
44	1
45	1
46	4
47	2
48	3
49	0
50	0
51	1
52	2
53	2
54	0
55	2
56	4
57	2
58	3
59	2
60	1
61	0
62	2
63	3
64	3
65	1
66	3
67	3
68	2
69	2
70	2
71	0
72	1
73	3
74	2
75	5
76	3
77	3
78	2
79	2
80	3
81	1
82	3
83	3
84	1
85	2
86	4
87	2
88	2
89	2
90	2
91	5
92	2
93	1
94	2
95	5
96	2
97	4
98	4
99	2
100	3

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	1
16	0
17	1
18	0
19	0
20	1
21	1
22	0
23	0
24	3
25	0
26	1
27	2
28	0
29	1
30	2
31	1
32	1
33	0
34	2
35	1
36	3
37	2
38	3
39	1
40	3
41	0
42	0
43	1
44	1
45	1
46	4
47	2
48	3
49	0
50	0
51	1
52	2
53	2
54	0
55	2
56	4
57	2
58	3
59	2
60	1
61	0
62	2
63	3
64	3
65	1
66	3
67	3
68	2
69	2
70	2
71	0
72	1
73	3
74	2
75	5
76	3
77	3
78	2
79	2
80	3
81	1
82	3
83	3
84	1
85	2
86	4
87	2
88	2
89	2
90	2
91	5
92	2
93	1
94	2
95	5
96	2
97	4
98	4
99	2
100	3

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	1
16	0
17	1
18	0
19	0
20	1
21	1
22	0
23	0
24	3
25	0
26	1
27	2
28	0
29	1
30	2
31	1
32	1
33	0
34	2
35	1
36	3
37	2
38	3
39	1
40	3
41	0
42	0
43	1
44	1
45	1
46	4
47	2
48	3
49	0
50	0
51	1
52	2
53	2
54	0
55	2
56	4
57	2
58	3
59	2
60	1
61	0
62	2
63	3
64	3
65	1
66	3
67	3
68	2
69	2
70	2
71	0
72	1
73	3
74	2
75	5
76	3
77	3
78	2
79	2
80	3
81	1
82	3
83	3
84	1
85	2
86	4
87	2
88	2
89	2
90	2
91	5
92	2
93	1
94	2
95	5
96	2
97	4
98	4
99	2
100	3