A321727 - cp's OEIS frontend

A321727 Number of permutations f of {1,...,n} such that prime(k) + prime(f(k)) + 1 is prime for every k = 1,...,n.

n	a(n)
1	1
2	1
3	1
4	2
5	6
6	10
7	31
8	76
9	696
10	4294
11	5772
12	8472
13	128064
14	147960
15	1684788
16	26114739
17	523452320
18	1029877159
19	1772807946
20	28736761941
21	19795838613
22	31445106424
23	1313504660737
24	54477761675626
25	105122845176663
26	2200119900732333
27	2761739099984389
28	83123428119278837
29	219734505495953342
30	7228968492870136475
31	13623311188546432233
32	625620139149376861330
33	18603738861035365389401
34	64952397216275572992159
35	3115094155636931821691880
36	4788927142804364353625983

[1, 1, 1, 2, 6, 10, 31, 76, 696, 4294, 5772, 8472, 128064, 147960, 1684788, 26114739, 523452320, 1029877159, 1772807946, 28736761941, 19795838613, 31445106424, 1313504660737, 54477761675626, 105122845176663, 2200119900732333, 2761739099984389, 83123428119278837, 219734505495953342, 7228968492870136475, 13623311188546432233, 625620139149376861330, 18603738861035365389401, 64952397216275572992159, 3115094155636931821691880, 4788927142804364353625983]

cp's OEIS Frontend

A321727 Number of permutations f of {1,...,n} such that prime(k) + prime(f(k)) + 1 is prime for every k = 1,...,n.

Table of values

List of values