Numbers x such that sigma(x)-x divides x-1, other than prime powers.

Terms

a(0) =77a(1) =611a(2) =1073a(3) =2033a(4) =5293a(5) =6031a(6) =9983a(7) =13969a(8) =15947a(9) =23489a(10) =25241a(11) =40301a(12) =49901a(13) =50249a(14) =51101a(15) =56759a(16) =65017a(17) =71677a(18) =85079a(19) =97217a(20) =97783a(21) =98099a(22) =99101a(23) =131237a(24) =142091a(25) =160133a(26) =165101a(27) =180767a(28) =189281a(29) =210367