\begin{alltt}
HW 6, Due Week 7
\BF{7.1}: 1, 3, 7, 9, 11, 13, 17, \bx{18}, 19, \bx{22}, 23, 27, \bx{28}, 29, 31, 40
\BF{7.2}: 3, 7, 9, \bx{10}, 15, \bx{16}, 17, 19, \bx{20}, 21, 23, \bx{24}, 35, 37
\BF{7.3}: 3, \bx{6}, 7, 9, \bx{12}, 13, 17, \bx{18}, 20, 23, 27, 28, 29, 30, 32, 34, 37
\end{alltt}