A143931 - cp's OEIS frontend

A143931 a(n) is the smallest positive integer x such that x^2 - n! is prime.

n	a(n)
1	2
2	2
3	3
4	11
5	19
6	31
7	79
8	209
9	607
10	1921
11	6337
12	21907
13	78913
14	295289
15	1143539
16	4574149
17	18859733
18	80014841
19	348776611
20	1559776279
21	7147792823
22	33526120127
23	160785623627
24	787685471389
25	3938427356623
26	20082117944263
27	104349745809077

[2, 2, 3, 11, 19, 31, 79, 209, 607, 1921, 6337, 21907, 78913, 295289, 1143539, 4574149, 18859733, 80014841, 348776611, 1559776279, 7147792823, 33526120127, 160785623627, 787685471389, 3938427356623, 20082117944263, 104349745809077]

cp's OEIS Frontend

A143931 a(n) is the smallest positive integer x such that x^2 - n! is prime.

Table of values

List of values