A383896 - cp's OEIS frontend

A383896 Echo numbers: positive integers k such that the largest prime factor of k-1 is a suffix of k.

n	a(n)
1	13
2	57
3	73
4	111
5	127
6	163
7	193
8	197
9	313
10	323
11	337
12	419
13	433
14	687
15	757
16	817
17	847
18	897
19	929
20	931
21	973
22	1037
23	1153
24	1177
25	1211
26	1641
27	2017
28	2311
29	2593
30	2623
31	2647
32	2913
33	3073
34	3137
35	3659
36	3661
37	3829
38	4031
39	4117
40	4213
41	4453
42	4483
43	4537
44	4673
45	4737
46	4971
47	5377
48	5741

[13, 57, 73, 111, 127, 163, 193, 197, 313, 323, 337, 419, 433, 687, 757, 817, 847, 897, 929, 931, 973, 1037, 1153, 1177, 1211, 1641, 2017, 2311, 2593, 2623, 2647, 2913, 3073, 3137, 3659, 3661, 3829, 4031, 4117, 4213, 4453, 4483, 4537, 4673, 4737, 4971, 5377, 5741]

cp's OEIS Frontend

A383896 Echo numbers: positive integers k such that the largest prime factor of k-1 is a suffix of k.

Table of values

List of values