

A161602


Positive integers k that are greater than the value of the reversal of k's binary representation.


4



2, 4, 6, 8, 10, 12, 13, 14, 16, 18, 20, 22, 24, 25, 26, 28, 29, 30, 32, 34, 36, 38, 40, 41, 42, 44, 46, 48, 49, 50, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81, 82, 84, 86, 88, 89, 90, 92, 94, 96, 97, 98, 100, 101, 102, 104, 105, 106, 108, 109
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OFFSET

1,1


COMMENTS

By "reversal" of k's binary representation, it is meant: write k in binary, reverse the order of its digits, and read the result as a binary value.
This sequence contains all the positive even integers.


LINKS

Jonathan Frech, Table of n, a(n) for n = 1..10000


EXAMPLE

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


MATHEMATICA

Select[Range[109], # > IntegerReverse[#, 2] &] (* Michael De Vlieger, Apr 07 2021 *)


PROG

(PARI) isok(k) = k > fromdigits(Vecrev(binary(k)), 2); \\ Michel Marcus, Apr 06 2021


CROSSREFS

Cf. A030101, A006995, A161601, A161603 (odd terms).
Cf. A071590 (using decimal reversal).
Sequence in context: A319807 A055954 A301454 * A285591 A327210 A274611
Adjacent sequences: A161599 A161600 A161601 * A161603 A161604 A161605


KEYWORD

base,nonn,changed


AUTHOR

Leroy Quet, Jun 14 2009


EXTENSIONS

More terms from Max Alekseyev, Sep 11 2009


STATUS

approved



