Number of primes of the form 7k+4 less than 10^n.
A091123
Number of primes of the form 7k+4 less than 10^n.
Terms
- a(0) =0a(1) =3a(2) =26a(3) =202a(4) =1601a(5) =13069a(6) =110776a(7) =960085a(8) =8474021a(9) =75841922a(10) =686340737a(11) =6267984796a(12) =57677570801a(13) =534156825708
External references
- oeis: A091123