Semiprimes of the form n^4 - n^3 - n - 1.

Terms

a(0) =187a(1) =1073a(2) =8989a(3) =35657a(4) =61423a(5) =151979a(6) =1632923a(7) =2495959a(8) =8345537a(9) =9658823a(10) =18687173a(11) =49194347a(12) =64880909a(13) =77244217a(14) =179502923a(15) =250046873a(16) =451259573a(17) =502874849a(18) =588444323a(19) =651263839a(20) =830296829a(21) =1723401587a(22) =1935548789a(23) =4552183739a(24) =4839132407a(25) =8739047573a(26) =13324055659