Numbers k such that phi(k + 4) | sigma(k) + 4.

Terms

a(0) =6a(1) =11a(2) =12a(3) =62a(4) =65a(5) =166a(6) =251a(7) =782a(8) =2342a(9) =6662a(10) =25040a(11) =83623931a(12) =933180002a(13) =943169410a(14) =1840122962a(15) =4294967291