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

Terms

a(0) =5a(1) =7a(2) =77a(3) =6293a(4) =12943a(5) =23495a(6) =30191a(7) =99695a(8) =147407a(9) =240425a(10) =258401a(11) =535601a(12) =1103825a(13) =1570145a(14) =1637867a(15) =1972607a(16) =2219135a(17) =2241281a(18) =2970517a(19) =3785951a(20) =5612321a(21) =5917003a(22) =6215951a(23) =9249241a(24) =9281899a(25) =12496429a(26) =14779531a(27) =25739701a(28) =30367321a(29) =33522251