Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.

Terms

a(0) =1a(1) =3a(2) =15a(3) =135a(4) =315a(5) =585a(6) =819a(7) =1155a(8) =1365a(9) =1485a(10) =2295a(11) =4455a(12) =9009a(13) =9405a(14) =9945a(15) =11115a(16) =13923a(17) =13965a(18) =16965a(19) =33705a(20) =34335a(21) =40365a(22) =43785a(23) =43875a(24) =63063a(25) =63855a(26) =84825a(27) =90675a(28) =106425a(29) =108927