Indices of primes in sequence defined by A(0) = 39, A(n) = 10*A(n-1) - 1 for n > 0.

Terms

a(0) =1a(1) =2a(2) =5a(3) =16a(4) =19a(5) =44a(6) =56a(7) =77a(8) =118a(9) =136a(10) =508a(11) =709a(12) =1126a(13) =1517a(14) =1760a(15) =3085a(16) =3146a(17) =9925a(18) =19853a(19) =27841a(20) =46798a(21) =49681a(22) =68717a(23) =100541a(24) =106648a(25) =191072