Numbers n such that sigma(n)=2n-phi(phi(n)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =76a(5) =410a(6) =890a(7) =1370a(8) =2330a(9) =5690a(10) =8090a(11) =8570a(12) =10490a(13) =10970a(14) =11930a(15) =14330a(16) =19130a(17) =21530a(18) =27770a(19) =32090a(20) =34490a(21) =35930a(22) =38330a(23) =39290a(24) =40730a(25) =44570a(26) =47930a(27) =49370a(28) =52730a(29) =54170