Indices of primes in sequence defined by A(0) = 31, A(n) = 10*A(n-1) - 9 for n > 0.

A101823

Indices of primes in sequence defined by A(0) = 31, A(n) = 10*A(n-1) - 9 for n > 0.

Terms

    a(0) =0a(1) =2a(2) =6a(3) =9a(4) =27a(5) =35a(6) =66a(7) =80a(8) =146a(9) =482a(10) =642a(11) =1019a(12) =1899a(13) =2619a(14) =10452a(15) =27719a(16) =52823a(17) =105588a(18) =111987a(19) =618852a(20) =665828

External references