A363683 - cp's OEIS frontend

A363683 Square array A(n, k), n, k > 0, read by antidiagonals; A(n, k) is the least e > 0 such that n^e and k^e have the same initial digit, or -1 if no such e exists.

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

[1, 4, 4, 9, 1, 9, 2, 17, 17, 2, 3, 7, 1, 7, 3, 4, 5, 8, 8, 5, 4, 5, 4, 9, 1, 9, 4, 5, 8, 2, 3, 11, 11, 3, 2, 8, 16, 5, 11, 6, 1, 6, 11, 5, 16, 1, 17, 7, 4, 9, 9, 4, 7, 17, 1, 1, 4, 17, 10, 6, 1, 6, 10, 17, 4, 1, 1, 4, 9, 14, 5, 15, 15, 5, 14, 9, 4, 1]

cp's OEIS Frontend

A363683 Square array A(n, k), n, k > 0, read by antidiagonals; A(n, k) is the least e > 0 such that n^e and k^e have the same initial digit, or -1 if no such e exists.

Table of values

List of values

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

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

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