A247244 - cp's OEIS frontend

A247244 Smallest prime p such that (n^p + (n+1)^p)/(2n+1) is prime, or -1 if no such p exists.

n	a(n)
1	3
2	3
3	3
4	5
5	3
6	3
7	7
8	3
9	7
10	53
11	47
12	3
13	7
14	3
15	3
16	41
17	3
18	5
19	11
20	3
21	3
22	11
23	11
24	3
25	5
26	103
27	3
28	37
29	17
30	7
31	13
32	37
33	3
34	269
35	17
36	5
37	17
38	3
39	5
40	139
41	3
42	11
43	78697
44	5
45	17
46	3671
47	13
48	491
49	5
50	3
51	31
52	43
53	7
54	3
55	7
56	2633
57	3
58	7
59	3
60	5
61	349
62	3
63	41
64	31
65	5
66	3
67	7
68	127
69	3
70	19
71	3
72	11
73	19
74	101
75	3
76	5
77	3
78	3

[3, 3, 3, 5, 3, 3, 7, 3, 7, 53, 47, 3, 7, 3, 3, 41, 3, 5, 11, 3, 3, 11, 11, 3, 5, 103, 3, 37, 17, 7, 13, 37, 3, 269, 17, 5, 17, 3, 5, 139, 3, 11, 78697, 5, 17, 3671, 13, 491, 5, 3, 31, 43, 7, 3, 7, 2633, 3, 7, 3, 5, 349, 3, 41, 31, 5, 3, 7, 127, 3, 19, 3, 11, 19, 101, 3, 5, 3, 3]

cp's OEIS Frontend

A247244 Smallest prime p such that (n^p + (n+1)^p)/(2n+1) is prime, or -1 if no such p exists.

Table of values

List of values