Nonprime numbers k such that sum of the divisors of k is a power of 2.

Terms

a(0) =1a(1) =21a(2) =93a(3) =217a(4) =381a(5) =651a(6) =889a(7) =2667a(8) =3937a(9) =11811a(10) =24573a(11) =27559a(12) =57337a(13) =82677a(14) =172011a(15) =253921a(16) =393213a(17) =761763a(18) =917497a(19) =1040257a(20) =1572861a(21) =1777447a(22) =2752491a(23) =3120771a(24) =3670009a(25) =4063201a(26) =5332341a(27) =7281799a(28) =11010027a(29) =12189603