Numbers n>0 such that 666*10^n+7 is prime.

Terms

a(0) =25a(1) =26a(2) =28a(3) =33a(4) =49a(5) =80a(6) =81a(7) =133a(8) =179a(9) =202a(10) =222a(11) =271a(12) =411a(13) =588a(14) =682a(15) =1039a(16) =2403a(17) =5802a(18) =11544a(19) =12484a(20) =41047a(21) =46396