%I A061536
%S A061536 1,2,4,6,9,12,16,20,24,28,33,38,44,50,56,62,69,76,84,92,100,108,117,
%T A061536 126,135,144,153,162,172,182,193,204,215,226,237,248,260,272,284,296,
%U A061536 309,322,336,350,364,378,393,408,423,438,453,468,484,500,516,532,548
%N A061536 a(n) = a(n-1) + the number of primes <= n.
%C A061536 a[1] = 1; a[n_] := a[n - 1] + PrimePi[n]; Table[ a[n], {n, 1, 70} ]
%C A061536 Partial sums of A000720. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 03 2009]
%H A061536 Harry J. Smith, <a href="b061536.txt">Table of n, a(n) for n=1,...,1000</
               a>
%o A061536 (PARI) { a=1; for (n=1, 1000, write("b061536.txt", n, " ", a+=primepi(n)) 
               ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 24 2009]
%Y A061536 Sequence in context: A033291 A105434 A145196 this_sequence A095114 A062048 
               A075354
%Y A061536 Adjacent sequences: A061533 A061534 A061535 this_sequence A061537 A061538 
               A061539
%K A061536 nonn
%O A061536 1,2
%A A061536 R. K. Guy, Robert G. Wilson v (rgwv(AT)rgwv.com), May 14 2001