Numbers n such that usigma(cototient(n)) is a prime.

Terms

a(0) =4a(1) =6a(2) =8a(3) =24a(4) =28a(5) =32a(6) =384a(7) =448a(8) =496a(9) =508a(10) =512a(11) =98304a(12) =114688a(13) =126976a(14) =130048a(15) =131056a(16) =131072