A358257 - cp's OEIS frontend

A358257 The least significant digit of k such that 2^k, 5^k, 8^k start with the same digit.

n	a(n)
1	0
2	5
3	5
4	8
5	8
6	8
7	1
8	1
9	1
10	4
11	4
12	4
13	7
14	7
15	7
16	0
17	0
18	0
19	3
20	3
21	3
22	6
23	6
24	6
25	9
26	9
27	2
28	2
29	2
30	5
31	5
32	5
33	8
34	8
35	8
36	1
37	1
38	1
39	4
40	4
41	4
42	7
43	7
44	7
45	0
46	0
47	0
48	3
49	3
50	3
51	6
52	6
53	6
54	9
55	9
56	9
57	2
58	2
59	2
60	5
61	5
62	5
63	8
64	8
65	8
66	1
67	1
68	1
69	4
70	4
71	4
72	7
73	7
74	7
75	0
76	0
77	0
78	3
79	3
80	3
81	6
82	6
83	6
84	9
85	9
86	9
87	2
88	2
89	2
90	5
91	5
92	8
93	8
94	8
95	1
96	1
97	1
98	4
99	4
100	4
101	7
102	7
103	7
104	0
105	0

[0, 5, 5, 8, 8, 8, 1, 1, 1, 4, 4, 4, 7, 7, 7, 0, 0, 0, 3, 3, 3, 6, 6, 6, 9, 9, 2, 2, 2, 5, 5, 5, 8, 8, 8, 1, 1, 1, 4, 4, 4, 7, 7, 7, 0, 0, 0, 3, 3, 3, 6, 6, 6, 9, 9, 9, 2, 2, 2, 5, 5, 5, 8, 8, 8, 1, 1, 1, 4, 4, 4, 7, 7, 7, 0, 0, 0, 3, 3, 3, 6, 6, 6, 9, 9, 9, 2, 2, 2, 5, 5, 8, 8, 8, 1, 1, 1, 4, 4, 4, 7, 7, 7, 0, 0]

cp's OEIS Frontend

A358257 The least significant digit of k such that 2^k, 5^k, 8^k start with the same digit.

Table of values

List of values

n	a(n)
1	0
2	5
3	5
4	8
5	8
6	8
7	1
8	1
9	1
10	4
11	4
12	4
13	7
14	7
15	7
16	0
17	0
18	0
19	3
20	3
21	3
22	6
23	6
24	6
25	9
26	9
27	2
28	2
29	2
30	5
31	5
32	5
33	8
34	8
35	8
36	1
37	1
38	1
39	4
40	4
41	4
42	7
43	7
44	7
45	0
46	0
47	0
48	3
49	3
50	3
51	6
52	6
53	6
54	9
55	9
56	9
57	2
58	2
59	2
60	5
61	5
62	5
63	8
64	8
65	8
66	1
67	1
68	1
69	4
70	4
71	4
72	7
73	7
74	7
75	0
76	0
77	0
78	3
79	3
80	3
81	6
82	6
83	6
84	9
85	9
86	9
87	2
88	2
89	2
90	5
91	5
92	8
93	8
94	8
95	1
96	1
97	1
98	4
99	4
100	4
101	7
102	7
103	7
104	0
105	0

n	a(n)
1	0
2	5
3	5
4	8
5	8
6	8
7	1
8	1
9	1
10	4
11	4
12	4
13	7
14	7
15	7
16	0
17	0
18	0
19	3
20	3
21	3
22	6
23	6
24	6
25	9
26	9
27	2
28	2
29	2
30	5
31	5
32	5
33	8
34	8
35	8
36	1
37	1
38	1
39	4
40	4
41	4
42	7
43	7
44	7
45	0
46	0
47	0
48	3
49	3
50	3
51	6
52	6
53	6
54	9
55	9
56	9
57	2
58	2
59	2
60	5
61	5
62	5
63	8
64	8
65	8
66	1
67	1
68	1
69	4
70	4
71	4
72	7
73	7
74	7
75	0
76	0
77	0
78	3
79	3
80	3
81	6
82	6
83	6
84	9
85	9
86	9
87	2
88	2
89	2
90	5
91	5
92	8
93	8
94	8
95	1
96	1
97	1
98	4
99	4
100	4
101	7
102	7
103	7
104	0
105	0

n	a(n)
1	0
2	5
3	5
4	8
5	8
6	8
7	1
8	1
9	1
10	4
11	4
12	4
13	7
14	7
15	7
16	0
17	0
18	0
19	3
20	3
21	3
22	6
23	6
24	6
25	9
26	9
27	2
28	2
29	2
30	5
31	5
32	5
33	8
34	8
35	8
36	1
37	1
38	1
39	4
40	4
41	4
42	7
43	7
44	7
45	0
46	0
47	0
48	3
49	3
50	3
51	6
52	6
53	6
54	9
55	9
56	9
57	2
58	2
59	2
60	5
61	5
62	5
63	8
64	8
65	8
66	1
67	1
68	1
69	4
70	4
71	4
72	7
73	7
74	7
75	0
76	0
77	0
78	3
79	3
80	3
81	6
82	6
83	6
84	9
85	9
86	9
87	2
88	2
89	2
90	5
91	5
92	8
93	8
94	8
95	1
96	1
97	1
98	4
99	4
100	4
101	7
102	7
103	7
104	0
105	0