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 A066120 Superduperprimorials: product of first n terms in Chernoff sequence. 12
 1, 2, 24, 8640, 653184000, 114069441024000000, 598216546007097937920000000000, 1601591599167888308924824752807936000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS First number with n distinct positive triangular exponents in its prime factorization. Subsequence of A025487. - Matthew Vandermast, Nov 05 2009; edited May 23 2012 LINKS Harry J. Smith, Table of n, a(n) for n = 0..17 FORMULA a(n) = Product_{i=1..n} prime(i)^((n-i+1)*(n-i+2)/2) = a(n-1)*A006939(n) = A066119(n-3, 4). EXAMPLE a(4) = 2*(2*(2*3))*(2*(2*3)*(2*3*5)) = 2*(2*6)*(2*6*30) = 2*12*360 = 8640. PROG (PARI) { for (n=0, 17, a=1; for(i=1, n, a*=prime(i)^((n - i + 1)*(n - i + 2)/2)); write("b066120.txt", n, " ", a) ) } \\ Harry J. Smith, Feb 01 2010 CROSSREFS Cf. A000040, A002110, A006939, A055462, A166475. Sequence in context: A203465 A055462 A088600 * A152687 A062716 A137888 Adjacent sequences:  A066117 A066118 A066119 * A066121 A066122 A066123 KEYWORD nonn,easy AUTHOR Henry Bottomley, Dec 05 2001 STATUS approved

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Last modified April 9 06:59 EDT 2020. Contains 333344 sequences. (Running on oeis4.)