A383296 - cp's OEIS frontend

A383296 Primorial base echo numbers: primorial base expansion of k has the largest prime factor of k-1 as its suffix.

n	a(n)
1	11
2	41
3	59
4	101
5	127
6	137
7	161
8	221
9	229
10	251
11	313
12	323
13	337
14	401
15	551
16	641
17	667
18	703
19	757
20	799
21	881
22	929
23	1001
24	1013
25	1093
26	1157
27	1177
28	1211
29	1369
30	1541
31	1583
32	1601
33	1667
34	1753
35	1873
36	1939
37	2017
38	2177
39	2201
40	2393
41	2501
42	2509
43	2561
44	2647
45	2669
46	3043
47	3079
48	3197
49	3217
50	3433
51	3521
52	3613
53	3649
54	3653
55	3823
56	3851
57	4001

[11, 41, 59, 101, 127, 137, 161, 221, 229, 251, 313, 323, 337, 401, 551, 641, 667, 703, 757, 799, 881, 929, 1001, 1013, 1093, 1157, 1177, 1211, 1369, 1541, 1583, 1601, 1667, 1753, 1873, 1939, 2017, 2177, 2201, 2393, 2501, 2509, 2561, 2647, 2669, 3043, 3079, 3197, 3217, 3433, 3521, 3613, 3649, 3653, 3823, 3851, 4001]

cp's OEIS Frontend

A383296 Primorial base echo numbers: primorial base expansion of k has the largest prime factor of k-1 as its suffix.

Table of values

List of values