A354155 - cp's OEIS frontend

A354155 Lagrange primes: primes p == 1 (mod 4) such that X = (p-1)/2 is the least solution in the interval [1, (p-1)/2] of the congruence (X!)^2 == -1 (mod p).

n	a(n)
1	5
2	13
3	17
4	29
5	41
6	53
7	73
8	97
9	137
10	229
11	241
12	257
13	281
14	313
15	397
16	409
17	449
18	457
19	461
20	521
21	541
22	617
23	653
24	661
25	677
26	733
27	769
28	809
29	853
30	857
31	929
32	953
33	997
34	1021
35	1069
36	1109
37	1201
38	1213
39	1217
40	1249
41	1277
42	1361
43	1373
44	1409
45	1489
46	1553
47	1597
48	1609
49	1621
50	1697

[5, 13, 17, 29, 41, 53, 73, 97, 137, 229, 241, 257, 281, 313, 397, 409, 449, 457, 461, 521, 541, 617, 653, 661, 677, 733, 769, 809, 853, 857, 929, 953, 997, 1021, 1069, 1109, 1201, 1213, 1217, 1249, 1277, 1361, 1373, 1409, 1489, 1553, 1597, 1609, 1621, 1697]

cp's OEIS Frontend

A354155 Lagrange primes: primes p == 1 (mod 4) such that X = (p-1)/2 is the least solution in the interval [1, (p-1)/2] of the congruence (X!)^2 == -1 (mod p).

Table of values

List of values