Primes with minimal digit = 6.

Terms

a(0) =67a(1) =677a(2) =769a(3) =967a(4) =6679a(5) =6689a(6) =6779a(7) =6869a(8) =6899a(9) =6967a(10) =6977a(11) =6997a(12) =7669a(13) =7687a(14) =7699a(15) =7867a(16) =8669a(17) =8677a(18) =8689a(19) =8699a(20) =8867a(21) =8969a(22) =9677a(23) =9679a(24) =9689a(25) =9697a(26) =9767a(27) =9769a(28) =9967a(29) =66697