Search: id:A141219
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%I A141219
%S A141219 1,4,6,8,6,8,8,12,12,12,12,16,12,16,24,14,24,16,18,24,24,18,32,24,20,28,
%T A141219 24,24,24,36,24,32,48,30,36,28,36,48,32,40,30,36,32,48,48,56,36,36,48,
%U A141219 40,48,38,60,40,72,42,48,72,42,48,72,44,60,48,54,84,48,64,48,80,64,56
%N A141219 Nonprimes of the form ((p(max)+1)*..*p*(p(min)-1)), where a(0)=1 and 
               (p(max))*..*p*(p(min)=k(n)=n-th nonprime.
%e A141219 If k(1)=4=(p(max)=2)*(p(min)=2), then (2+1)*(2-1)=3*1=3
%e A141219 (prime).
%e A141219 If k(2)=6=(p(max)=3)*(p(min)=2), then
%e A141219 (3+1)*(2-1)=4*1=4 (nonprime)=a(1).
%e A141219 If k(3)=8=(p(max)=2)*(p=2)*(p(min)=2), then
%e A141219 (2+1)*2*(2-1)=3*2*1=6 (nonprime)=a(2), etc.
%Y A141219 Sequence in context: A071851 A083256 A083257 this_sequence A159576 A163639 
               A095253
%Y A141219 Adjacent sequences: A141216 A141217 A141218 this_sequence A141220 A141221 
               A141222
%K A141219 nonn
%O A141219 1,2
%A A141219 Juri-Stepan Gerasimov (2stepan(AT)rambler.ru) Aug 7 2008
%E A141219 a(6), a(54), a(71) corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 18 2008

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