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 A088860 Twice the primorials (first definition), 2*A002110(n). 9
 4, 12, 60, 420, 4620, 60060, 1021020, 19399380, 446185740, 12939386460, 401120980260, 14841476269620, 608500527054420, 26165522663340060, 1229779565176982820, 65178316954380089460, 3845520700308425278140 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also, least number m divisible by 4 such that omega(m)=n, where omega=A001221. Refers to the least number which is the leg of exactly 2^(n-1) primitive Pythagorean triangles. For n >= 1, a(n) = A097250(n). - G. C. Greubel, Apr 23 2017 LINKS G. C. Greubel, Table of n, a(n) for n = 1..345 FORMULA a(n) = 2*#p(n) = 2*A002110(n). MATHEMATICA 2*FoldList[Times, 1, Prime[Range[50]]] (* G. C. Greubel, Apr 23 2017 *) CROSSREFS Cf. A002110, A001221, A097250. Sequence in context: A324693 A276707 A083484 * A097250 A188328 A291772 Adjacent sequences:  A088857 A088858 A088859 * A088861 A088862 A088863 KEYWORD nonn AUTHOR Lekraj Beedassy, Nov 25 2003 EXTENSIONS Corrected by G. C. Greubel, Apr 23 2017. Edited by N. J. A. Sloane, Apr 23 2017 STATUS approved

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Last modified May 16 06:54 EDT 2021. Contains 343939 sequences. (Running on oeis4.)