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A056835 a(n) = lcm(s(1),...,s(n)) where {s(n)} = A024619 and a(0) = 1. 2
1, 6, 30, 60, 420, 420, 1260, 1260, 1260, 13860, 27720, 360360, 360360, 360360, 360360, 6126120, 6126120, 6126120, 116396280, 116396280, 116396280, 116396280, 116396280, 116396280, 2677114440, 5354228880, 26771144400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Robert Israel, Table of n, a(n) for n = 0..3930

EXAMPLE

Overlaps with but is different from A003418 and A051451. E.g., 840 or 720720 are not here, but 1260 and 13860 are here, not there.

MAPLE

N:= 100: # to get a(0) to a(N)

A[0]:= 1:

m:= 0:

for s from 2 while m < N do

if nops(numtheory:-factorset(s)) > 1 then

  m:= m+1;

  A[m]:= ilcm(A[m-1], s);

fi

od:

seq(A[i], i=0..N); # Robert Israel, Dec 20 2015

MATHEMATICA

s = Select[Range@ 50, ! PrimePowerQ@ # &]; Table[LCM @@ Take[s, n], {n, Length@ s}] (* Michael De Vlieger, Dec 20 2015 *)

CROSSREFS

Cf. A024619, A003418, A051451. Range of values is A056836. All members belong to A025487.

Sequence in context: A181827 A263573 A145010 * A056836 A277521 A163640

Adjacent sequences:  A056832 A056833 A056834 * A056836 A056837 A056838

KEYWORD

nonn

AUTHOR

Labos Elemer, Aug 30 2000

EXTENSIONS

Link typos corrected, cross-reference added by Matthew Vandermast, Nov 13 2010

STATUS

approved

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Last modified December 9 19:51 EST 2019. Contains 329879 sequences. (Running on oeis4.)