Smallest prime factor of n-th term in Look and Say sequence A005150, with a(1)=1.

Terms

a(0) =1a(1) =11a(2) =3a(3) =7a(4) =11a(5) =312211a(6) =13112221a(7) =11a(8) =5581a(9) =26966089a(10) =7a(11) =20328937a(12) =29a(13) =3a(14) =3a(15) =3a(16) =1637a(17) =103a(18) =50593a(19) =43a(20) =13a(21) =19a(22) =17a(23) =103a(24) =31a(25) =19a(26) =7a(27) =3a(28) =19a(29) =1208033