|
%I #3 Oct 01 2013 21:35:26
%S 0,8,169,2371,25059,655974,57509995,1616756446,28550646649,
%T 442195486325,-2830020810398,208945571225276
%N Number of primes < 10^(2n) - sum of primes < 10^n.
%C For 2n = 20, we get a negative value -2830020810398. This seems strange to me.
%C I emailed Marc Deleglise on this. The links shows the Pi(x) and SumP(x) values.
%H Cino Hilliard, <a href="http://docs.google.com/Doc?docid=dgpq9w4b_27fmg8k2fk&hl=en">Comparison of Pi(x^2) and SumP(x)</a>.
%F Pi(x) is the prime counting function or the number of primes <= x. SumP(x) = sum of primes <= x.
%Y Cf. A046731, A000720, A006880.
%K sign
%O 0,2
%A _Cino Hilliard_, Jun 11 2008
| 