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 A074094 a(1) = 1; for n > 1, a(n) = LCM of next n composite numbers. 1
 1, 12, 360, 1680, 27720, 1965600, 116396280, 758696400, 18465927480, 3962129371200, 5637782470320, 546077803471200, 592841333318073840, 717574218173821008000, 66020319718147594800, 111304867624125438463200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS I.e., "next n composite numbers" following those that were used in computing a(n-1); see Example section. - Jon E. Schoenfield, Mar 18 2018 LINKS Robert Israel, Table of n, a(n) for n = 1..356 FORMULA for n >= 2, a(n) = lcm(A002808(A000217(n-1)...A000217(n)-1)). - Robert Israel, Jan 13 2016 EXAMPLE a(2) = lcm(4,6) = 12; a(3) = lcm(8,9,10) = 360; a(4) = lcm(12,14,15,16) = 1680. MAPLE comps:= remove(isprime, [\$2..10^4]): N:= floor((sqrt(9+8*nops(comps))-1)/2): 1, seq(ilcm(op(comps[(n-1)*n/2 .. n*(n+1)/2-1])), n=2..N); # Robert Israel, Jan 13 2016 MATHEMATICA Join[{1}, i = 3; Table[t = {}; c = 0; While[c != n, If[! PrimeQ[i], AppendTo[t, i]; c++]; i++]; LCM @@ t, {n, 2, 16}]] (* Jayanta Basu, Jul 30 2013 *) CROSSREFS Cf. A000217, A002808. Sequence in context: A134800 A053068 A046969 * A012553 A128043 A012431 Adjacent sequences:  A074091 A074092 A074093 * A074095 A074096 A074097 KEYWORD nonn AUTHOR Amarnath Murthy, Aug 20 2002 EXTENSIONS More terms from Sascha Kurz, Jan 14 2003 Offset corrected by Robert Israel, Jan 13 2016 STATUS approved

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Last modified September 24 15:28 EDT 2021. Contains 347643 sequences. (Running on oeis4.)