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

Terms

a(0) =1a(1) =3a(2) =5a(3) =11a(4) =23a(5) =55a(6) =87a(7) =123a(8) =383a(9) =501a(10) =957a(11) =1015a(12) =3565a(13) =3777a(14) =5667a(15) =6141a(16) =9069a(17) =11033a(18) =13827a(19) =27347a(20) =35119a(21) =44693a(22) =55645a(23) =91915a(24) =137037a(25) =156919a(26) =180251a(27) =233935a(28) =261989a(29) =269395