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

Terms

a(0) =915a(1) =12957a(2) =20745a(3) =26985a(4) =54621a(5) =97785a(6) =111615a(7) =188013a(8) =191775a(9) =197631a(10) =231045a(11) =258687a(12) =428745a(13) =565761a(14) =726645a(15) =793653a(16) =807639a(17) =829857a(18) =941451a(19) =1048719a(20) =1084587a(21) =1224111a(22) =1233027a(23) =1863255a(24) =1920681a(25) =1973805a(26) =2043489a(27) =2129883a(28) =2254119a(29) =2265417