\x09 \x09 \x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09 \x09 \x09 \x09\x09\x09 \x09 \x09 \x09 \x09 \x09 \x09\x09 \x09 \x09 \x09\x09
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
push +1(1b) mark null push +10(4b) dup dup getc retr div add dup push +4(3b) mul push +0(0b) retr sub push +1(1b) retr sub push +4(3b) retr sub push +5(3b) retr sub jzero null push +10(4b) retr dup putc push +37(6b) mod copy +1(1b) stor jump null