A137998 - cp's OEIS frontend

A137998 Least k such that floor(16^n / 10^k) = 1, 2, 4 or 8 (mod 10), or zero if no such k exists.

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

[1, 2, 3, 0, 3, 1, 2, 2, 5, 4, 1, 4, 2, 4, 4, 1, 2, 4, 2, 2, 1, 3, 2, 7, 5, 1, 2, 4, 3, 3, 1, 2, 2, 3, 4, 1, 4, 2, 4, 3, 1, 2, 4, 2, 2, 1, 5, 2, 5, 3, 1, 2, 5, 7, 4, 1, 2, 2, 3, 4, 1, 3, 2, 7, 3, 1, 2, 4, 2, 2, 1, 12, 2, 3, 7, 1, 2, 3, 5, 7, 1, 2, 2, 3, 4, 1, 3, 2, 5, 3, 1, 2, 3, 2, 2, 1, 6, 2, 3, 5, 1, 2, 3, 4, 3]

cp's OEIS Frontend

A137998 Least k such that floor(16^n / 10^k) = 1, 2, 4 or 8 (mod 10), or zero if no such k exists.

Table of values

List of values

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

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

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