Number of primes of the form 7k+2 less than 10^n.
A091121
Number of primes of the form 7k+2 less than 10^n.
Terms
- a(0) =1a(1) =4a(2) =27a(3) =203a(4) =1584a(5) =13065a(6) =110771a(7) =960114a(8) =8474796a(9) =75841428a(10) =686342043a(11) =6267979692a(12) =57677527046a(13) =534156912056
External references
- oeis: A091121