A089776 - cp's OEIS frontend

A089776 If n mod 10 is 1, 3, 7, or 9, then a(n) = least prime of the form 1 followed by n^r; else a(n) = least prime of the form n^r followed by a 1. In both cases r must be > 1 and a(n) = 0 if no such prime exists.

n	a(n)
1	11
2	41
3	13
4	41
5	251
6	61
7	17
8	641
9	19
10	101
11	114641
12	0
13	113
14	75295361
15	151
16	40961
17	1289
18	181
19	1361
20	4001
21	11025506433613486607375777617584133309366191904729927960524981845743709132117581
22	1368800680154120519681
23	1907846434775996175406740561329
24	241
25	251
26	6761
27	127
28	281
29	1500246412961
30	9001
31	131

[11, 41, 13, 41, 251, 61, 17, 641, 19, 101, 114641, 0, 113, 75295361, 151, 40961, 1289, 181, 1361, 4001, 11025506433613486607375777617584133309366191904729927960524981845743709132117581, 1368800680154120519681, 1907846434775996175406740561329, 241, 251, 6761, 127, 281, 1500246412961, 9001, 131]

cp's OEIS Frontend

A089776 If n mod 10 is 1, 3, 7, or 9, then a(n) = least prime of the form 1 followed by n^r; else a(n) = least prime of the form n^r followed by a 1. In both cases r must be > 1 and a(n) = 0 if no such prime exists.

Table of values

List of values