A383927 - cp's OEIS frontend

A383927 Binary echo numbers: positive integers k such that the gpf(k-1) is a suffix of k when gpf(k-1) and k are written in binary.

n	a(n)
1	7
2	15
3	19
4	21
5	55
6	61
7	63
8	71
9	101
10	115
11	127
12	155
13	157
14	163
15	181
16	255
17	273
18	295
19	301
20	331
21	349
22	351
23	365
24	487
25	501
26	541
27	573
28	585
29	599
30	631
31	687
32	711
33	723
34	741
35	781
36	817
37	827
38	901
39	1055
40	1135
41	1211
42	1277
43	1331
44	1361
45	1387
46	1405
47	1459
48	1471
49	1475
50	1501
51	1621
52	1641
53	1751

[7, 15, 19, 21, 55, 61, 63, 71, 101, 115, 127, 155, 157, 163, 181, 255, 273, 295, 301, 331, 349, 351, 365, 487, 501, 541, 573, 585, 599, 631, 687, 711, 723, 741, 781, 817, 827, 901, 1055, 1135, 1211, 1277, 1331, 1361, 1387, 1405, 1459, 1471, 1475, 1501, 1621, 1641, 1751]

cp's OEIS Frontend

A383927 Binary echo numbers: positive integers k such that the gpf(k-1) is a suffix of k when gpf(k-1) and k are written in binary.

Table of values

List of values