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

Terms

a(0) =3a(1) =5a(2) =7a(3) =10a(4) =15a(5) =21a(6) =24a(7) =30a(8) =31a(9) =33a(10) =42a(11) =47a(12) =57a(13) =69a(14) =78a(15) =79a(16) =93a(17) =102a(18) =114a(19) =127a(20) =129a(21) =135a(22) =145a(23) =161a(24) =174a(25) =177a(26) =186a(27) =210a(28) =213a(29) =216