Numbers k such that phi(k) | sigma(k + 12).

Terms

a(0) =1a(1) =2a(2) =3a(3) =10a(4) =12a(5) =14a(6) =15a(7) =16a(8) =18a(9) =21a(10) =26a(11) =30a(12) =35a(13) =39a(14) =42a(15) =44a(16) =54a(17) =65a(18) =75a(19) =76a(20) =90a(21) =108a(22) =123a(23) =126a(24) =153a(25) =156a(26) =165a(27) =218a(28) =234a(29) =252