(Number of primes == 3 mod 4 less than 10^n) - (number of primes == 1 mod 4 less than 10^n).
A091295
(Number of primes == 3 mod 4 less than 10^n) - (number of primes == 1 mod 4 less than 10^n).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =10a(4) =25a(5) =147a(6) =218a(7) =446a(8) =551a(9) =5960a(10) =14252a(11) =63337a(12) =118472a(13) =183457a(14) =951700a(15) =3458334a(16) =6284060a(17) =2581691a(18) =80743228a(19) =259753425
External references
- oeis: A091295