Search: id:A074252
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%I A074252
%S A074252 1,4,12,30,84,9150,47244,75360,177287,281868,705790,3043504,9669715,
%T A074252 20139930,32043111,67447484,291217662,7544909388,8396469108,21425170627
%N A074252 Number of primes <= n is equal to the sum of square-free numbers from 
               the smallest prime factor of n to the largest prime factor of n.
%e A074252 pi(84) = 23 and 84 = 2^2*3*7 and 2+3+5+6+7 = 23.
%Y A074252 Cf. A000720.
%Y A074252 Sequence in context: A000298 A006802 A068055 this_sequence A074210 A005289 
               A037255
%Y A074252 Adjacent sequences: A074249 A074250 A074251 this_sequence A074253 A074254 
               A074255
%K A074252 more,nonn
%O A074252 0,2
%A A074252 Jason Earls (zevi_35711(AT)yahoo.com), Sep 20 2002
%E A074252 a(6)-a(19) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 12 
               2008

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