Smallest prime factor of A077586(n).

Terms

a(0) =7a(1) =127a(2) =2147483647a(4) =47a(5) =338193759479a(6) =231733529a(7) =62914441a(8) =2351a(9) =1399a(11) =18287a(12) =106937a(13) =863a(14) =4703a(15) =138863