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%I #18 Aug 17 2018 09:24:09
%S 100,110,1000,1001,1010,1100,1110,1111,10000,10010,10100,10101,10110,
%T 11000,11001,11010,11011,11100,11110,100000,100001,100010,100011,
%U 100100,100110,100111,101000,101010,101100,101101,101110,110000,110001
%N Composite positive integers written in base 2.
%C If n is in the sequence then so is 10 * n. - _David A. Corneth_, Aug 17 2018
%H Robert Israel, <a href="/A115454/b115454.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = A007088(A002808(n)).
%p map(convert,remove(isprime, [$4..200]),binary); # _Robert Israel_, Aug 17 2018
%t For[n = 2, n < 50, n++, If[Not[PrimeQ[n]], Print[BaseForm[n, 2]]]] (* _Stefan Steinerberger_, Jan 24 2006 *)
%o (PARI) lista(nn) = forcomposite(n=1, nn, print1(fromdigits(binary(n), 10), ", ")); \\ _Michel Marcus_, Aug 17 2018
%Y Cf. A002808, A007088, A004676.
%K base,nonn
%O 1,1
%A _Leroy Quet_, Jan 22 2006
%E More terms from _Stefan Steinerberger_, Jan 24 2006
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