A321597 - cp's OEIS frontend

A321597 Number of permutations tau of {1,...,n} such that k*tau(k) + 1 is prime for every k = 1,...,n.

n	a(n)
1	1
2	2
3	1
4	6
5	1
6	24
7	9
8	38
9	36
10	702
11	196
12	7386
13	3364
14	69582
15	45369
16	885360
17	110224
18	14335236
19	640000
20	19867008
21	11009124
22	1288115340
23	188485441
24	17909627257
25	4553145529
26	363106696516
27	149376066064
28	11141446425852
29	990882875761
30	371060259505399
31	16516486146304
32	1479426535706319
33	497227517362801
34	102319410607145600
35	32589727661167504
36	12597253470226980096

[1, 2, 1, 6, 1, 24, 9, 38, 36, 702, 196, 7386, 3364, 69582, 45369, 885360, 110224, 14335236, 640000, 19867008, 11009124, 1288115340, 188485441, 17909627257, 4553145529, 363106696516, 149376066064, 11141446425852, 990882875761, 371060259505399, 16516486146304, 1479426535706319, 497227517362801, 102319410607145600, 32589727661167504, 12597253470226980096]

cp's OEIS Frontend

A321597 Number of permutations tau of {1,...,n} such that k*tau(k) + 1 is prime for every k = 1,...,n.

Table of values

List of values