Number of primes == 7 (mod 10) less than 10^n.
A073507
Number of primes == 7 (mod 10) less than 10^n.
Terms
- a(0) =1a(1) =6a(2) =46a(3) =308a(4) =2411a(5) =19621a(6) =166211a(7) =1440495a(8) =12712314a(9) =113764039a(10) =1029518337a(11) =9401997000a(12) =86516367790
External references
- oeis: A073507