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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. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The analog of A061563 in base 2. Differs from A062128 only for those n, which are palindromes in base 2.

LINKS

Table of n, a(n) for n=0..42.

EXAMPLE

23: 10111 -> 10111 + 11101 = 110100 -> 110100 + 1011 = 111111, so a(23) = 111111.

PROG

(ARIBAS): stop := 500; for k := 0 to 60 do c := 0; m := k; test := true; while test and c < stop do inc(c); m := m + bit_reverse(m); test := m <> bit_reverse(m); end; if c < stop then bit_write(m); else write(-1); end; write(" "); end; .

CROSSREFS

Cf. A061563, A062128, A062131, A058042.

Sequence in context: A038325 A268922 A328918 * A290298 A283218 A283136

Adjacent sequences:  A062126 A062127 A062128 * A062130 A062131 A062132

KEYWORD

base,easy,sign

AUTHOR

Klaus Brockhaus, Jun 06 2001

STATUS

approved

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Last modified May 12 11:55 EDT 2021. Contains 343821 sequences. (Running on oeis4.)