128 bits by 51b

: a over + swap do i c@ 7. do dup 2 mod 0 .r 2/ loop . loop ; s" \x90\x9f\x88@\xb9.\xc7\xda\x1b\x82j\xa3\xc6j\x11\x03"a

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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