A085324 - cp's OEIS frontend

A085324 a(n) is the least exponent so that reverse(n^a(n)) is a prime number. a(n)=0 if no such exponent exists, namely when e.g., n = 3k or n = 11k, k > 1.

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	1
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	2
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	1
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	1
71	1
72	0
73	1
74	1
75	0
76	1
77	0
78	0
79	1
80	8
81	0
82	6
83	11
84	0
85	2
86	28
87	0
88	0
89	2
90	0
91	1
92	1
93	0
94	292
95	1
96	0
97	1
98	1

[0, 1, 1, 2, 1, 0, 1, 8, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 2, 1, 0, 0, 8, 0, 13, 47, 0, 2, 7, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 2, 2, 0, 5, 0, 0, 22, 15, 0, 6, 1, 0, 3, 10, 0, 0, 143, 0, 88, 12, 0, 4, 2, 0, 4, 8, 0, 39, 83, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 8, 0, 6, 11, 0, 2, 28, 0, 0, 2, 0, 1, 1, 0, 292, 1, 0, 1, 1]

cp's OEIS Frontend

A085324 a(n) is the least exponent so that reverse(n^a(n)) is a prime number. a(n)=0 if no such exponent exists, namely when e.g., n = 3k or n = 11k, k > 1.

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	1
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	2
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	1
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	1
71	1
72	0
73	1
74	1
75	0
76	1
77	0
78	0
79	1
80	8
81	0
82	6
83	11
84	0
85	2
86	28
87	0
88	0
89	2
90	0
91	1
92	1
93	0
94	292
95	1
96	0
97	1
98	1

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	1
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	2
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	1
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	1
71	1
72	0
73	1
74	1
75	0
76	1
77	0
78	0
79	1
80	8
81	0
82	6
83	11
84	0
85	2
86	28
87	0
88	0
89	2
90	0
91	1
92	1
93	0
94	292
95	1
96	0
97	1
98	1

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	1
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	2
41	2
42	0
43	5
44	0
45	0
46	22
47	15
48	0
49	6
50	1
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	1
71	1
72	0
73	1
74	1
75	0
76	1
77	0
78	0
79	1
80	8
81	0
82	6
83	11
84	0
85	2
86	28
87	0
88	0
89	2
90	0
91	1
92	1
93	0
94	292
95	1
96	0
97	1
98	1