Successive prime factors of 10^(10^100) - 10.

Terms

a(0) =2a(1) =3a(2) =3a(3) =3a(4) =3a(5) =5a(6) =37a(7) =67a(8) =83a(9) =199a(10) =397a(11) =1231a(12) =1627a(13) =2707a(14) =3637a(15) =4519a(16) =21649a(17) =30307a(18) =34849a(19) =51203a(20) =52711a(21) =54547a(22) =56369a(23) =97561a(24) =115963a(25) =123493a(26) =136043a(27) =139987a(28) =149077a(29) =173923