A062131 A062129 written in base 10.

0, 3, 3, 9, 5, 15, 9, 21, 9, 27, 15, 27, 15, 27, 21, 45, 17, 51, 27, 99, 99, 63, -1, 63, 27, 99, -1, 255, -1, 63, 45, 93, 33, 99, 51, -1, 45, -1, 63, 99, 45, -1, 63, 99, 99, -1, -1, -1, 51, -1, 255, 153, 63, 99, 255, 153, 63, 99, 255, 153, -1, -1, 93, 189, 65, 195, 99, -1, 85, 255, 119, 387, 255, 219, 13299, -1, 387, -1, -1, 219

Offset

0,2

Comments

Differs from A062130 only for those n, which are palindromes in base 2.

Links

Table of n, a(n) for n=0..79.

Example

23 -> 23 + 29 = 52 -> 52 + 11 = 63, so a(23) = 63.

Prog

(ARIBAS): stop := 500; for k := 0 to 80 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 write(m); else write(-1); end; write(" "); end; .

Crossrefs

Cf. A061563, A062129, A062130, A061561.

Sequence in context: A300782 A104195 A294178 * A199663 A124871 A197414

Adjacent sequences: A062128 A062129 A062130 * A062132 A062133 A062134

Keyword

base,easy,sign

Author

Klaus Brockhaus, Jun 06 2001

Status

approved