%I A124808
%S A124808 1,2,3,4,5,6,7,7,8,9,10,11,12,13,14,15,16,17,17,18,19,20,21,22,23,24,25,
%T A124808 26,27,28,29,30,30,31,32,33,34,35,35,36,37,37,38,38,39,40,41,42,43,44,
%U A124808 45,46,47,48,49,50,51,51,52,53,54,55,56,57,58,59,60,61,61,62,62,63,64
%N A124808 Number of numbers k <= n such that k^2 + 1 is square-free.
%C A124808 a(0)=1, a(n) = a(n-1) + 0^(A059592(n) - 1).
%Y A124808 Sequence in context: A097043 A053759 A060431 this_sequence A017862 A155919 
               A075011
%Y A124808 Adjacent sequences: A124805 A124806 A124807 this_sequence A124809 A124810 
               A124811
%K A124808 nonn
%O A124808 0,2
%A A124808 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 08 2006