Numbers n such that reverse(sigma(n)) = n - phi(n) = cototient(n).

Terms

a(0) =136a(1) =261a(2) =295a(3) =493a(4) =1218a(5) =1576a(6) =15976a(7) =159976a(8) =715381a(9) =717181a(10) =746341a(11) =987109a(12) =1585576a(13) =5989003a(14) =13390567a(15) =14400136a(16) =19326607a(17) =78753211a(18) =144144136a(19) =145454536a(20) =158401576a(21) =275675661a(22) =713791681a(23) =737098261a(24) =1440000136a(25) =1441584136a(26) =1454414536a(27) =1455998536