Numbers k such that phi(k) | sigma(k + 2).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =9a(6) =10a(7) =12a(8) =13a(9) =18a(10) =21a(11) =22a(12) =25a(13) =28a(14) =36a(15) =38a(16) =40a(17) =42a(18) =45a(19) =52a(20) =55a(21) =58a(22) =60a(23) =90a(24) =93a(25) =108a(26) =112a(27) =117a(28) =130a(29) =152