A355035 - cp's OEIS frontend

A355035 Consider the least base b >= 2 where the sum of digits of n is a prime number; a(n) corresponds to this prime number.

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

[2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 3, 3, 2, 2, 2, 3, 2, 3, 3, 5, 2, 3, 3, 3, 3, 3, 2, 5, 2, 2, 2, 3, 2, 3, 3, 3, 2, 3, 3, 5, 3, 3, 7, 5, 2, 3, 3, 5, 3, 7, 2, 5, 3, 3, 7, 5, 5, 5, 5, 3, 13, 2, 2, 3, 2, 3, 3, 7, 2, 3, 3, 5, 3, 7, 3, 5, 2, 3, 3, 3, 3, 3, 5, 5, 3]

cp's OEIS Frontend

A355035 Consider the least base b >= 2 where the sum of digits of n is a prime number; a(n) corresponds to this prime number.

Table of values

List of values

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

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

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