Composite numbers n such that the sum of proper divisors of n divides 2^n+1.

Terms

a(0) =15a(1) =45a(2) =99a(3) =735a(4) =1221a(5) =1645a(6) =1725a(7) =1925a(8) =2871a(9) =4047a(10) =8667a(11) =13311a(12) =16461a(13) =19647a(14) =21285a(15) =27797a(16) =39861a(17) =52215a(18) =52965a(19) =65637a(20) =67479a(21) =74781a(22) =106327a(23) =124215a(24) =126975a(25) =155511a(26) =181917a(27) =240397a(28) =244839a(29) =257951