A217785 - cp's OEIS frontend

A217785 Smallest integer s>n such that 1+2s+3s^2+...+n*s^{n-1} is prime.

n	a(n)
2	3
3	12
4	12
5	9
6	21
7	12
8	26
9	23
10	30
11	24
12	138
13	33
14	80
15	32
16	54
17	192
18	48
19	40
20	4500
21	48
22	50
23	192
24	30
25	88
26	32
27	114
28	178
29	48
30	45
31	42
32	356
33	41
34	53
35	138
36	174
37	66
38	44
39	990
40	120
41	819
42	2898
43	112
44	1052
45	122
46	164
47	132
48	108
49	77
50	540
51	198
52	106
53	135
54	237
55	98
56	234
57	162
58	83
59	720
60	3870
61	135
62	188
63	1014
64	94
65	489
66	180
67	110
68	204
69	180
70	107
71	468
72	1542
73	508
74	218
75	608
76	88
77	102
78	228
79	140
80	3890
81	93
82	361
83	1848
84	462
85	99
86	125
87	390
88	92
89	237
90	933
91	172
92	606
93	303
94	208
95	924
96	114
97	266
98	156
99	410
100	1330

[3, 12, 12, 9, 21, 12, 26, 23, 30, 24, 138, 33, 80, 32, 54, 192, 48, 40, 4500, 48, 50, 192, 30, 88, 32, 114, 178, 48, 45, 42, 356, 41, 53, 138, 174, 66, 44, 990, 120, 819, 2898, 112, 1052, 122, 164, 132, 108, 77, 540, 198, 106, 135, 237, 98, 234, 162, 83, 720, 3870, 135, 188, 1014, 94, 489, 180, 110, 204, 180, 107, 468, 1542, 508, 218, 608, 88, 102, 228, 140, 3890, 93, 361, 1848, 462, 99, 125, 390, 92, 237, 933, 172, 606, 303, 208, 924, 114, 266, 156, 410, 1330]

cp's OEIS Frontend

A217785 Smallest integer s>n such that 1+2s+3s^2+...+n*s^{n-1} is prime.

Table of values

List of values

cp's OEIS Frontend

A217785 Smallest integer s>n such that 1+2*s+3*s^2+...+n*s^{n-1} is prime.

Table of values

List of values

A217785 Smallest integer s>n such that 1+2s+3s^2+...+n*s^{n-1} is prime.