Search: id:A066120
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%I A066120
%S A066120 1,2,24,8640,653184000,114069441024000000,
%T A066120 598216546007097937920000000000,
%U A066120 1601591599167888308924824752807936000000000000000
%N A066120 Superduperprimorials: product of first n terms in Chernoff sequence.
%C A066120 First number with n distinct positive triangular exponents. Subsequence 
               of A025487. [From Matthew Vandermast (ghodges14(AT)comcast.net), 
               Nov 05 2009]
%F A066120 a(n) = Product_{1< = i< = n}[prime(i)^((n-i+1)(n-i+2)/2)] = a(n-1)*A006939(n) 
               = A066119(n-3, 4).
%e A066120 a(4) = 2*(2*(2*3))*(2*(2*3)*(2*3*5)) =2*(2*6)*(2*6*30) =2*12*360 =8640
%Y A066120 Cf. A000040, A002110, A006939, A055462.
%Y A066120 Sequence in context: A088912 A055462 A088600 this_sequence A152687 A062716 
               A137888
%Y A066120 Adjacent sequences: A066117 A066118 A066119 this_sequence A066121 A066122 
               A066123
%K A066120 nonn
%O A066120 0,2
%A A066120 Henry Bottomley (se16(AT)btinternet.com), Dec 05 2001

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