Semiprimes of the form (2^k - m)*(m*2^k - 1).

Terms

a(0) =9a(1) =14a(2) =49a(3) =55a(4) =94a(5) =115a(6) =446a(7) =611a(8) =869a(9) =961a(10) =4031a(11) =4315a(12) =7891a(13) =7934a(14) =8143a(15) =11651a(16) =16129a(17) =16255a(18) =32254a(19) =37301a(20) =51089a(21) =54701a(22) =60311a(23) =64931a(24) =65279a(25) =65441a(26) =241519a(27) =287509a(28) =321029a(29) =367459