A088123 - cp's OEIS frontend

A088123 Let f(n,x) = 1 + 2x + 3x^2 + 5x^3 + 7x^4 + ... + prime(n)*x^n; a(n) = smallest value of x such that f(n,x) is a prime, or 0 if no such prime exists.

n	a(n)
1	1
2	2
3	1
4	6
5	1
6	6
7	1
8	8
9	1
10	74
11	6
12	6
13	1
14	2
15	11
16	102
17	20
18	88
19	1
20	52
21	10
22	18
23	2
24	56
25	1
26	26
27	37
28	216
29	1
30	78
31	1
32	28
33	21
34	160
35	3
36	276
37	30
38	1542
39	42
40	598
41	20
42	20
43	333
44	186
45	8
46	82
47	11
48	90
49	1
50	246
51	1
52	240
53	83
54	58
55	9
56	76
57	1
58	16
59	21
60	700
61	60
62	10
63	87
64	250
65	62
66	406
67	2
68	502
69	140
70	186
71	1293
72	578

[1, 2, 1, 6, 1, 6, 1, 8, 1, 74, 6, 6, 1, 2, 11, 102, 20, 88, 1, 52, 10, 18, 2, 56, 1, 26, 37, 216, 1, 78, 1, 28, 21, 160, 3, 276, 30, 1542, 42, 598, 20, 20, 333, 186, 8, 82, 11, 90, 1, 246, 1, 240, 83, 58, 9, 76, 1, 16, 21, 700, 60, 10, 87, 250, 62, 406, 2, 502, 140, 186, 1293, 578]

cp's OEIS Frontend

A088123 Let f(n,x) = 1 + 2x + 3x^2 + 5x^3 + 7x^4 + ... + prime(n)*x^n; a(n) = smallest value of x such that f(n,x) is a prime, or 0 if no such prime exists.

Table of values

List of values