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

Terms

a(0) =5225a(1) =20405a(2) =181685a(3) =210395a(4) =302375a(5) =302445a(6) =524975a(7) =1469555a(8) =1563485a(9) =1748855a(10) =2791085a(11) =3097055a(12) =4418375a(13) =4542065a(14) =4735115a(15) =5482235a(16) =5567705a(17) =5568615a(18) =5683205a(19) =5753405a(20) =6457055a(21) =7363013a(22) =7531205a(23) =8016435a(24) =8043875a(25) =9534185a(26) =10511345a(27) =10790325a(28) =11504405