A172035 - cp's OEIS frontend

A172035 Smallest exponent k > 1 that sum of digits of k-th power of the n-th prime is a prime (n=1,2,...) or 0 if no such k exists.

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

[5, 0, 2, 2, 9, 3, 2, 5, 3, 2, 7, 2, 4, 5, 2, 2, 5, 2, 3, 6, 2, 2, 2, 2, 4, 8, 4, 2, 2, 4, 2, 8, 2, 3, 2, 2, 4, 4, 6, 2, 4, 2, 10, 3, 4, 2, 3, 2, 4, 3, 5, 6, 3, 4, 4, 2, 2, 2, 2, 2, 3, 4, 3, 3, 3, 5, 3, 3, 8, 2, 3, 12, 2, 3, 2, 5, 2, 3, 8, 16, 8, 3, 4, 2, 3, 2, 4, 2, 2, 5, 7, 4, 3, 8, 3, 2, 6, 2, 3, 6, 2, 2, 10]

cp's OEIS Frontend

A172035 Smallest exponent k > 1 that sum of digits of k-th power of the n-th prime is a prime (n=1,2,...) or 0 if no such k exists.

Table of values

List of values

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

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

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