Not declaring a new variable speeds it up by a reasonable amount - and dropping the unneeded printf: 
for( 0b000000000000111111..0b111111000000000000 ) {
  $_ = sprintf("%018b",$_);
  next unless /^0*10*10*10*10*10*10*$/;
  print "$_\n";
}

[download]

cLive ;-)

--
seek(JOB,$$LA,0);

In reply to Re: Is there a faster way to do this? by cLive ;-)
in thread Permutations in binary by Anonymous Monk

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