Numbers k such that phi(k) | sigma(k + 3).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =8a(6) =12a(7) =14a(8) =19a(9) =20a(10) =21a(11) =24a(12) =27a(13) =30a(14) =32a(15) =39a(16) =52a(17) =63a(18) =84a(19) =91a(20) =102a(21) =112a(22) =117a(23) =127a(24) =129a(25) =132a(26) =135a(27) =155a(28) =165a(29) =181