Numbers k such that sigma(k+1) = 4*phi(k).

Terms

a(0) =2a(1) =6a(2) =14a(3) =20a(4) =30a(5) =54a(6) =104a(7) =114a(8) =132a(9) =140a(10) =234a(11) =252a(12) =279a(13) =314a(14) =434a(15) =539a(16) =620a(17) =644a(18) =798a(19) =860a(20) =1064a(21) =1080a(22) =1154a(23) =1287a(24) =1308a(25) =1500a(26) =1595a(27) =1715a(28) =1904a(29) =2232