For n>=2, a(n) = prime[prime[a(n-1)] + a(n-1)]; a(1)=1.

A106045

For n>=2, a(n) = prime[prime[a(n-1)] + a(n-1)]; a(1)=1.

Terms

    a(0) =1a(1) =5a(2) =53a(3) =1931a(4) =207869a(5) =51294911a(6) =24248219519

External references