Search: id:A141220
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%I A141220
%S A141220 1,4,8,10,10,9,14,16,15,14,18,20,28,15,30,18,21,32,26,36,30,21,30,28,27,
%T A141220 26,42,25,40,54,35,38,30,45,52,36,42,42,33,54,64,60,39,38,50,45,60,39,
%U A141220 70,42,78,45,56,90,54,76,45,62,52,63,90,50,66,49,84,80,63,78,70,57,60
%N A141220 Nonprimes of the form ((p(max)+2)*..*p*(p(min)-1)), where a(0)=1 and 
               (p(max))*..*p*(p(min)=k(n)=n-th nonprime.
%e A141220 If k(1)=4=(p(max)=2)*(p(min)=2), then (2+2)*(2-1)=4*1=4
%e A141220 (nonprime)=a(1).
%e A141220 If k(2)=6=(p(max)=3)*(p(min)=2), then
%e A141220 (3+2)*(2-1)=5*1=5 (prime).
%e A141220 If k(3)=8=(p(max)=2)*(p=2)*(p(min)=2), then
%e A141220 (2+2)*2*(2-1)=4*2*1=8 (nonprime)=a(2), etc.
%Y A141220 Sequence in context: A072037 A084093 A076703 this_sequence A108806 A074776 
               A153762
%Y A141220 Adjacent sequences: A141217 A141218 A141219 this_sequence A141221 A141222 
               A141223
%K A141220 nonn
%O A141220 1,2
%A A141220 Juri-Stepan Gerasimov (2stepan(AT)rambler.ru) Aug 7 2008

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