Smallest solution m to (n+1)*phi(m) = n*sigma(m), or -1 if no solution exists.

Terms

a(0) =3a(1) =5a(2) =7a(3) =323a(4) =11a(5) =13a(6) =899a(7) =17a(8) =19a(9) =1763a(10) =23a(11) =5249a(12) =3239a(13) =29a(14) =31a(15) =979801a(16) =5459a(17) =37a(18) =10763a(19) =41a(20) =43a(21) =9179a(22) =47a(23) =9701a(24) =10403a(25) =53a(26) =12319a(27) =5646547a(28) =59a(29) =61