Smallest prime factor of googol - n that exceeds 13, or 1 if googol - n is 13-smooth.

Terms

a(0) =1a(1) =41a(2) =220217a(3) =596275259857a(4) =17a(5) =31a(6) =7583a(7) =167988019a(8) =1898431a(9) =19a(10) =37a(11) =8747a(12) =433a(13) =23a(15) =1637a(16) =29a(17) =1997a(18) =569a(19) =383a(20) =71a(21) =17a(22) =179a(24) =601a(25) =1259a(26) =109a(27) =47a(28) =19a(29) =83a(30) =367a(31) =43