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A099795 Least common multiple of 1, 2, 3, ..., prime(n)-1. 7
1, 2, 12, 60, 2520, 27720, 720720, 12252240, 232792560, 80313433200, 2329089562800, 144403552893600, 5342931457063200, 219060189739591200, 9419588158802421600, 3099044504245996706400, 164249358725037825439200, 9690712164777231700912800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..342

FORMULA

a(n) = (A094998(n)-1) / A099796(n).

a(n) = A038610(A000040(n)). - Anthony Browne, Jul 19 2016

MAPLE

Primes:= select(isprime, [2, $3..100]):

seq(ilcm($2..Primes[i]-1), i=1..nops(Primes)); # Robert Israel, Jul 19 2016

MATHEMATICA

LCM@@Range[#]&/@(Prime[Range[20]]-1) (* Harvey P. Dale, Jan 30 2015 *)

PROG

(MAGMA) [Lcm([2..p-1]): p in PrimesUpTo(70)]; // Bruno Berselli, Feb 06 2015

CROSSREFS

Cf. A094998, A099794, A099796, A038610, A000040.

Sequence in context: A145630 A082688 A099996 * A127044 A245091 A037562

Adjacent sequences:  A099792 A099793 A099794 * A099796 A099797 A099798

KEYWORD

nonn

AUTHOR

Ray Chandler, Oct 29 2004

EXTENSIONS

a(18) from Bruno Berselli, Feb 06 2015

STATUS

approved

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Last modified April 18 11:07 EDT 2019. Contains 322209 sequences. (Running on oeis4.)