A062129 - cp's OEIS frontend

A062129 In base 2: start with n; add to itself with digits reversed; if palindrome, stop; otherwise repeat; a(n) gives palindrome at which it stops, or -1 if no palindrome is ever reached.

n	a(n)
0	0
1	11
2	11
3	1001
4	101
5	1111
6	1001
7	10101
8	1001
9	11011
10	1111
11	11011
12	1111
13	11011
14	10101
15	101101
16	10001
17	110011
18	11011
19	1100011
20	1100011
21	111111
22	-1
23	111111
24	11011
25	1100011
26	-1
27	11111111
28	-1
29	111111
30	101101
31	1011101
32	100001
33	1100011
34	110011
35	-1
36	101101
37	-1
38	111111
39	1100011
40	101101
41	-1
42	111111

[0, 11, 11, 1001, 101, 1111, 1001, 10101, 1001, 11011, 1111, 11011, 1111, 11011, 10101, 101101, 10001, 110011, 11011, 1100011, 1100011, 111111, -1, 111111, 11011, 1100011, -1, 11111111, -1, 111111, 101101, 1011101, 100001, 1100011, 110011, -1, 101101, -1, 111111, 1100011, 101101, -1, 111111]

cp's OEIS Frontend

A062129 In base 2: start with n; add to itself with digits reversed; if palindrome, stop; otherwise repeat; a(n) gives palindrome at which it stops, or -1 if no palindrome is ever reached.

Table of values

List of values