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

Terms

a(0) =660a(1) =744a(2) =4216a(3) =6460a(4) =10780a(5) =11880a(6) =14688a(7) =27820a(8) =32524a(9) =37464a(10) =40120a(11) =59964a(12) =87124a(13) =110770a(14) =120934a(15) =125764a(16) =184264a(17) =190564a(18) =194584a(19) =210324a(20) =264280a(21) =269514a(22) =295144a(23) =297388a(24) =298840a(25) =314974a(26) =379204a(27) =384750a(28) =396256a(29) =396520