a(n) is the number of numbers less than or equal to 10^n that are divisible only by primes congruent to 3 mod 4.
A369107
a(n) is the number of numbers less than or equal to 10^n that are divisible only by primes congruent to 3 mod 4.
Terms
- a(0) =4a(1) =26a(2) =201a(3) =1680a(4) =14902a(5) =135124a(6) =1243370a(7) =11587149a(8) =108941388a(9) =1031330156a(10) =9816605847
External references
- oeis: A369107