Numbers k such that phi(5k+1) = sigma(k).

Terms

a(0) =5005a(1) =6745a(2) =79695a(3) =99145a(4) =160195a(5) =166135a(6) =296065a(7) =350935a(8) =486805a(9) =960355a(10) =1291105a(11) =1350745a(12) =1817365a(13) =2218645a(14) =2445685a(15) =3287680a(16) =4069135a(17) =5341375a(18) =5497965a(19) =8933085a(20) =14495065a(21) =15106795a(22) =16824535a(23) =16850995a(24) =18510055a(25) =18710125a(26) =21309085a(27) =21521500a(28) =22453345