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A235336 Numbers having evil number of 1's in their binary representation. 2
0, 7, 11, 13, 14, 19, 21, 22, 25, 26, 28, 31, 35, 37, 38, 41, 42, 44, 47, 49, 50, 52, 55, 56, 59, 61, 62, 63, 67, 69, 70, 73, 74, 76, 79, 81, 82, 84, 87, 88, 91, 93, 94, 95, 97, 98, 100, 103, 104, 107, 109, 110, 111, 112, 115, 117, 118, 119, 121, 122, 123, 124, 125, 126, 131 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A000120(a(n)) is in A001969.

Except for 0, the first term in which the sequence differs from A075930 is the 27th: a(27) = 63.

Also a(27) = 63 is the first odd term that is not in A092246. - Altug Alkan, Mar 18 2018

LINKS

Robert Israel, Table of n, a(n) for n = 0..10000

EXAMPLE

7 in binary has 3 1's and since 3 is evil (i.e., belongs to A001969), then 7 is in the sequence.

MAPLE

filter:= n ->

  convert(convert(convert(convert(n, base, 2), `+`), base, 2), `+`)::even:

select(filter, [$0..131]); # Robert Israel, Mar 18 2018

CROSSREFS

Cf. A001969, A000120.

Sequence in context: A155501 A271500 A271499 * A075930 A014311 A245178

Adjacent sequences:  A235333 A235334 A235335 * A235337 A235338 A235339

KEYWORD

nonn,base

AUTHOR

Vladimir Shevelev, Jan 06 2014

STATUS

approved

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Last modified July 11 20:03 EDT 2020. Contains 335652 sequences. (Running on oeis4.)