A058998 - cp's OEIS frontend

A058998 Least exponent k for which n^k reversed (leading zeros are not allowed) is a prime, or 0 if impossible.

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	0
7	1
8	8
9	0
10	0
11	1
12	0
13	1
14	1
15	0
16	1
17	1
18	0
19	2
20	0
21	0
22	0
23	8
24	0
25	13
26	47
27	0
28	2
29	7
30	0
31	1
32	1
33	0
34	1
35	1
36	0
37	1
38	1
39	0
40	0
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	0
51	0
52	3
53	10
54	0
55	0
56	143
57	0
58	88
59	12
60	0
61	4
62	2
63	0
64	4
65	8
66	0
67	39
68	83
69	0
70	0
71	1
72	0
73	1
74	1
75	0

[0, 1, 1, 2, 1, 0, 1, 8, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 2, 0, 0, 0, 8, 0, 13, 47, 0, 2, 7, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 2, 0, 5, 0, 0, 22, 15, 0, 6, 0, 0, 3, 10, 0, 0, 143, 0, 88, 12, 0, 4, 2, 0, 4, 8, 0, 39, 83, 0, 0, 1, 0, 1, 1, 0]

cp's OEIS Frontend

A058998 Least exponent k for which n^k reversed (leading zeros are not allowed) is a prime, or 0 if impossible.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	0
7	1
8	8
9	0
10	0
11	1
12	0
13	1
14	1
15	0
16	1
17	1
18	0
19	2
20	0
21	0
22	0
23	8
24	0
25	13
26	47
27	0
28	2
29	7
30	0
31	1
32	1
33	0
34	1
35	1
36	0
37	1
38	1
39	0
40	0
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	0
51	0
52	3
53	10
54	0
55	0
56	143
57	0
58	88
59	12
60	0
61	4
62	2
63	0
64	4
65	8
66	0
67	39
68	83
69	0
70	0
71	1
72	0
73	1
74	1
75	0

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	0
7	1
8	8
9	0
10	0
11	1
12	0
13	1
14	1
15	0
16	1
17	1
18	0
19	2
20	0
21	0
22	0
23	8
24	0
25	13
26	47
27	0
28	2
29	7
30	0
31	1
32	1
33	0
34	1
35	1
36	0
37	1
38	1
39	0
40	0
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	0
51	0
52	3
53	10
54	0
55	0
56	143
57	0
58	88
59	12
60	0
61	4
62	2
63	0
64	4
65	8
66	0
67	39
68	83
69	0
70	0
71	1
72	0
73	1
74	1
75	0

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	0
7	1
8	8
9	0
10	0
11	1
12	0
13	1
14	1
15	0
16	1
17	1
18	0
19	2
20	0
21	0
22	0
23	8
24	0
25	13
26	47
27	0
28	2
29	7
30	0
31	1
32	1
33	0
34	1
35	1
36	0
37	1
38	1
39	0
40	0
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	0
51	0
52	3
53	10
54	0
55	0
56	143
57	0
58	88
59	12
60	0
61	4
62	2
63	0
64	4
65	8
66	0
67	39
68	83
69	0
70	0
71	1
72	0
73	1
74	1
75	0