A075341 - cp's OEIS frontend

A075341 a(1) = 1, a(2n) is the smallest composite number == 1 mod (a(2n-1)) and a(2n+1) is the smallest prime == 1 (mod a(2n)).

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	8
7	17
8	18
9	19
10	20
11	41
12	42
13	43
14	44
15	89
16	90
17	181
18	182
19	547
20	548
21	1097
22	1098
23	7687
24	7688
25	15377
26	15378
27	30757
28	30758
29	276823
30	276824
31	553649
32	553650
33	2768251
34	2768252
35	8304757
36	8304758
37	99657097
38	99657098
39	199314197
40	199314198

[1, 4, 5, 6, 7, 8, 17, 18, 19, 20, 41, 42, 43, 44, 89, 90, 181, 182, 547, 548, 1097, 1098, 7687, 7688, 15377, 15378, 30757, 30758, 276823, 276824, 553649, 553650, 2768251, 2768252, 8304757, 8304758, 99657097, 99657098, 199314197, 199314198]

cp's OEIS Frontend

A075341 a(1) = 1, a(2n) is the smallest composite number == 1 mod (a(2n-1)) and a(2n+1) is the smallest prime == 1 (mod a(2n)).

Table of values

List of values