|
%I #33 Mar 12 2022 02:09:00
%S 0,0,2,3,4,7,11,16,25,40,65,102,168,275,446,739,1229,2039,3401,5703,
%T 9592,16144,27293,46243,78498,133551,227647,388683,664579,1138288,
%U 1951957,3351550,5761455,9915892,17082666,29458442,50847534,87842213,151876932,262795354
%N Number of primes up to 10^(n/4).
%F a(n) = primepi(10^(n/4)).
%e a(1) = 0 because 10^(1/4) = 1.77828... and there are no primes less than that.
%e a(2) = 2 because sqrt(10) = 3.16228... and there are 2 primes below that.
%e a(3) = 3 because 10^(3/4) = 5.62341... and there are 3 primes below that.
%t Table[PrimePi[10^(n/4)], {n, 0, 39}] (* _Alonso del Arte_, Jan 26 2013 *)
%Y Cf. A000720, A006880, A018072.
%K nonn,hard
%O 0,3
%A _Vladimir Pletser_, Jan 26 2013
|
