Numbers k such that phi(k) | sigma(k + 9).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =10a(7) =12a(8) =13a(9) =14a(10) =21a(11) =24a(12) =26a(13) =30a(14) =31a(15) =37a(16) =42a(17) =45a(18) =48a(19) =50a(20) =57a(21) =60a(22) =68a(23) =76a(24) =78a(25) =96a(26) =105a(27) =111a(28) =133a(29) =156