

A125495


Composite odious numbers.


2



4, 8, 14, 16, 21, 22, 25, 26, 28, 32, 35, 38, 42, 44, 49, 50, 52, 55, 56, 62, 64, 69, 70, 74, 76, 81, 82, 84, 87, 88, 91, 93, 94, 98, 100, 104, 110, 112, 115, 117, 118, 121, 122, 124, 128, 133, 134, 138, 140, 143, 145, 146, 148, 152, 155, 158, 161, 162, 164, 168, 171
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OFFSET

1,1


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000


EXAMPLE

49 is in the sequence since it is composite and base2 representation (110001) has an odd number of 1's.


MAPLE

a:=proc(n) local n2: n2:=convert(n, base, 2): if add(n2[j], j=1..nops(n2)) mod 2 = 1 and isprime(n)=false then n else fi end: seq(a(n), n=2..210); # Emeric Deutsch, Jan 01 2007


MATHEMATICA

Select[Range[171], OddQ @ DigitCount[#, 2][[1]] && CompositeQ[#] &] (* Amiram Eldar, Dec 09 2019 *)


CROSSREFS

Intersection of A002808 (the composite numbers) and A000069 (odious numbers).
Sequence in context: A312255 A312256 A229937 * A246158 A312257 A312258
Adjacent sequences: A125492 A125493 A125494 * A125496 A125497 A125498


KEYWORD

base,nonn


AUTHOR

Tanya Khovanova, Dec 27 2006


EXTENSIONS

More terms from Emeric Deutsch, Jan 01 2007


STATUS

approved



