A161603 Odd terms of sequence A161602.

13, 25, 29, 41, 49, 53, 57, 59, 61, 81, 89, 97, 101, 105, 109, 113, 115, 117, 121, 123, 125, 145, 161, 169, 177, 181, 185, 193, 197, 201, 205, 209, 211, 213, 217, 221, 225, 227, 229, 233, 235, 237, 241, 243, 245, 247, 249, 251, 253, 289, 305

Offset: 1

Author

Leroy Quet, Jun 14 2009

Keywords

• base
• nonn

Examples

			29 in binary is 11101. Its digital reversal is 10111, which is 23 in decimal. Since 29 > 23, and since 29 is odd, 29 is in this sequence.
		

Crossrefs

Cf. A030101, A006995, A161601, A161602.

Programs

Mathematica

Select[Range[1,311,2],#>FromDigits[Reverse[IntegerDigits[#,2]],2]&] (* Harvey P. Dale, Feb 20 2013 *)

Python

from itertools import count, islice
def A161603_gen(startvalue=1): # generator of terms >= startvalue
    return filter(lambda n:n>int(bin(n)[-1:1:-1],2),count(max(startvalue|1,1),2))
A161603_list = list(islice(A161603_gen(),20)) # Chai Wah Wu, Jan 19 2023

Extensions

More terms from Max Alekseyev, Dec 10 2011