Numbers m for which sum of divisors of sum of divisors of m is a power of 2.

Terms

a(0) =1a(1) =2a(2) =4a(3) =16a(4) =25a(5) =50a(6) =64a(7) =100a(8) =361a(9) =1444a(10) =1600a(11) =4096a(12) =5776a(13) =9025a(14) =36100a(15) =65536a(16) =102400a(17) =262144a(18) =1478656a(19) =1638400a(20) =6553600a(21) =23658496a(22) =36966400a(23) =94633984a(24) =591462400a(25) =1073741824a(26) =2365849600a(27) =26843545600a(28) =387620798464