Deficient-perfect numbers: Deficient numbers n such that n/(2n-sigma(n)) is an integer.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =10a(5) =16a(6) =32a(7) =44a(8) =64a(9) =128a(10) =136a(11) =152a(12) =184a(13) =256a(14) =512a(15) =752a(16) =884a(17) =1024a(18) =2048a(19) =2144a(20) =2272a(21) =2528a(22) =4096a(23) =8192a(24) =8384a(25) =12224a(26) =16384a(27) =17176a(28) =18632a(29) =18904