A194231 - cp's OEIS frontend

A194231 Numbers k such that at least one of k and k+2 is composite, while for every b coprime to k*(k+2), b^(k-1) == 1 (mod k) and b^(k+1) == 1 (mod k+2).

n	a(n)
1	561
2	1103
3	2465
4	2819
5	6599
6	29339
7	41039
8	52631
9	62743
10	172079
11	188459
12	278543
13	340559
14	488879
15	656599
16	656601
17	670031
18	1033667
19	1909001
20	2100899
21	3146219
22	5048999
23	6049679
24	8719307
25	10024559
26	10402559
27	10877579
28	11119103
29	12261059
30	14913989
31	15247619

[561, 1103, 2465, 2819, 6599, 29339, 41039, 52631, 62743, 172079, 188459, 278543, 340559, 488879, 656599, 656601, 670031, 1033667, 1909001, 2100899, 3146219, 5048999, 6049679, 8719307, 10024559, 10402559, 10877579, 11119103, 12261059, 14913989, 15247619]

cp's OEIS Frontend

A194231 Numbers k such that at least one of k and k+2 is composite, while for every b coprime to k*(k+2), b^(k-1) == 1 (mod k) and b^(k+1) == 1 (mod k+2).

Table of values

List of values