Numbers k such that phi(k) | sigma(k+4).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =7a(5) =8a(6) =10a(7) =17a(8) =18a(9) =24a(10) =26a(11) =42a(12) =50a(13) =52a(14) =54a(15) =56a(16) =65a(17) =75a(18) =80a(19) =81a(20) =87a(21) =90a(22) =110a(23) =111a(24) =114a(25) =120a(26) =126a(27) =154a(28) =164a(29) =186