Composite numbers n such that if x = sigma(n)-phi(n)-n then n = sigma(x)-phi(x)-x.

Terms

a(0) =12a(1) =42a(2) =1242a(3) =2010a(4) =2358a(5) =57990a(6) =65802a(7) =1782198a(8) =1890738a(9) =2504920a(10) =2733880a(11) =3286128a(12) =4181968a(13) =6137440a(14) =7861200a(15) =8233134a(16) =11208018a(17) =15228688a(18) =21445340a(19) =24563812a(20) =33714690a(21) =38928126a(22) =185154858a(23) =207494658a(24) =221604534a(25) =247017798a(26) =341398422a(27) =366777018