A321805 - cp's OEIS frontend

A321805 Number of permutations f of {1,...,n} such that k!*f(k) + 1 is prime for every k from 1 to n.

n	a(n)
1	1
2	2
3	4
4	6
5	10
6	10
7	13
8	40
9	212
10	702
11	3531
12	19008
13	34858
14	39764
15	102312
16	47927
17	94860
18	232006
19	658766
20	829583
21	1547703
22	2040211
23	32073218
24	51347260
25	496226762
26	1504307318
27	16663026685
28	125080784519
29	241032642271
30	1216752358950
31	2147004248698
32	9320087810948
33	19383919945950
34	16259146126113
35	81023699301023
36	124167501991213

[1, 2, 4, 6, 10, 10, 13, 40, 212, 702, 3531, 19008, 34858, 39764, 102312, 47927, 94860, 232006, 658766, 829583, 1547703, 2040211, 32073218, 51347260, 496226762, 1504307318, 16663026685, 125080784519, 241032642271, 1216752358950, 2147004248698, 9320087810948, 19383919945950, 16259146126113, 81023699301023, 124167501991213]

cp's OEIS Frontend

A321805 Number of permutations f of {1,...,n} such that k!*f(k) + 1 is prime for every k from 1 to n.

Table of values

List of values