A164861 Odd positive integers that are not palindromes when written in binary.

11, 13, 19, 23, 25, 29, 35, 37, 39, 41, 43, 47, 49, 53, 55, 57, 59, 61, 67, 69, 71, 75, 77, 79, 81, 83, 87, 89, 91, 95, 97, 101, 103, 105, 109, 111, 113, 115, 117, 121, 123, 125, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 155, 157, 159, 161, 163, 167

Offset: 1

Author

Leroy Quet, Aug 28 2009

Keywords

• base
• nonn

Comments

These are the odd members of A154809.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A154809.

Programs

Haskell

a164861 n = a164861_list !! (n-1)
a164861_list = filter ((== 0) . a178225) a005408_list
-- Reinhard Zumkeller, Oct 21 2011

Mathematica

npbQ[n_]:=Module[{idn2=IntegerDigits[n,2]},idn2!=Reverse[idn2]]; Select[ Range[1,201,2],npbQ] (* Harvey P. Dale, May 17 2012 *)

Formula

A178225(a(n)) * (1 - A000035(a(n))) = 0. [Reinhard Zumkeller, Oct 21 2011]

Extensions

Extended by Ray Chandler, Mar 14 2010