Indices of primes in the sequence defined by A(0) = 21, A(n) = 10*A(n-1) + 31 for n > 0.

A101957

Indices of primes in the sequence defined by A(0) = 21, A(n) = 10*A(n-1) + 31 for n > 0.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =10a(4) =29a(5) =127a(6) =182a(7) =374a(8) =2158a(9) =2567a(10) =3368a(11) =24988a(12) =38809a(13) =59557a(14) =74873

External references