A113320 - cp's OEIS frontend

A113320 a(1)=1 and a(n) for n>1 has the smallest positive value such that Sum_{i=1..n} a(i)^a(n-i+1) is prime.

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	4
7	4
8	4
9	6
10	2
11	6
12	4
13	18
14	6
15	4
16	20
17	6
18	30
19	4
20	40
21	30
22	8
23	18
24	16
25	40
26	128
27	24
28	40
29	58
30	194
31	78
32	84
33	56
34	56
35	72
36	112
37	98
38	300
39	444
40	54
41	978
42	1938
43	120
44	126
45	6
46	1750

[1, 1, 1, 2, 2, 4, 4, 4, 6, 2, 6, 4, 18, 6, 4, 20, 6, 30, 4, 40, 30, 8, 18, 16, 40, 128, 24, 40, 58, 194, 78, 84, 56, 56, 72, 112, 98, 300, 444, 54, 978, 1938, 120, 126, 6, 1750]

cp's OEIS Frontend

A113320 a(1)=1 and a(n) for n>1 has the smallest positive value such that Sum_{i=1..n} a(i)^a(n-i+1) is prime.

Table of values

List of values