Indices of primes in sequence defined by A(0) = 61, A(n) = 10*A(n-1) - 9 for n > 0.

Terms

a(0) =0a(1) =1a(2) =7a(3) =8a(4) =14a(5) =19a(6) =25a(7) =37a(8) =44a(9) =64a(10) =111a(11) =243a(12) =302a(13) =392a(14) =559a(15) =838a(16) =1008a(17) =1018a(18) =1172a(19) =1333a(20) =2235a(21) =2628a(22) =4425a(23) =8847a(24) =20811a(25) =37743a(26) =72925a(27) =86286a(28) =231616a(29) =281968