%I A033997
%S A033997 9,2474,6694,7785,709838,126789311423
%N A033997 Numbers n such that sum of first n primes is a square.
%H A033997 G. L. Honaker Jr. and C. Caldwell, <a href="http://primes.utm.edu/curios/
               page.php?curio_id=179">Prime Curios!: 9</a>
%H A033997 C. Riveras, PrimePuzzles.Net, <a href="http://www.primepuzzles.net/puzzles/
               puzz_009.htm">Problem 9: Sum of first k primes is perfect square</
               a>
%F A033997 a(n) = PrimePi(A033998(n))
%e A033997 Sum of first 9 primes is 2+3+5+7+11+13+17+19+23 = 100, which is square, 
               so 9 is in the sequence.
%Y A033997 Cf. A000040, A033998, A061888, A061890.
%Y A033997 Sequence in context: A013827 A058428 A069704 this_sequence A068729 A159775 
               A162013
%Y A033997 Adjacent sequences: A033994 A033995 A033996 this_sequence A033998 A033999 
               A034000
%K A033997 nonn
%O A033997 1,1
%A A033997 Calculated by Jud McCranie (j.mccranie(AT)comcast.net)
%E A033997 126789311423 from Giovanni Resta (g.resta(AT)iit.cnr.it), May 27 2003
%E A033997 Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Mar 20 2007