A091162 - OEIS

%I #4 Oct 27 2019 10:17:29

%S 1,6,44,309,2409,19611,166169,1440483,12712625,113763849

%N Number of primes of the form 12k + 5 less than 10^n.

%t Table[Total[Table[If[IntegerQ[(n-5)/12],1,0],{n,Prime[Range[ PrimePi[ 10^k]]]}]],{k,10}] (* _Harvey P. Dale_, Oct 27 2019 *)

%Y Cf. A091161 + A091162 + A091163 + A091164 +2 (for 2 & 3) = A006880.

%K nonn

%O 1,2

%A _Robert G. Wilson v_, Jan 12 2004