Numbers n such that sigma(n) = n-th composite number.

Terms

a(0) =6a(1) =8a(2) =10a(3) =14a(4) =27a(5) =39a(6) =51a(7) =57a(8) =745a(9) =755a(10) =7091a(11) =268243a(12) =439681a(13) =3271489a(14) =33559819a(15) =74138989a(16) =80194627a(17) =179405777a(18) =1131818923a(19) =1170569879a(20) =1324475807a(21) =1324478657a(22) =51086967247a(23) =72229691441a(24) =72229691533a(25) =72229691993a(26) =72229693511