A082736 LCM of n-th group of terms in A074147.

1, 4, 105, 120, 109395, 55440, 1856277675, 42325920, 966710699955, 7210803600, 303646176781042095, 43790142876480, 2432266195067253069525, 6338767304469600, 12793596869123737224933375, 659267412349963697280

Offset: 1

Author

Amarnath Murthy, Apr 14 2003

Keywords

• nonn

Crossrefs

Cf. A074147, A074148, A074149, A082735.

Programs

Maple

A061925 := proc(n) ceil(n^2/2)+1 ; end: A082736 := proc(n) seq(A061925(n-1)+2*k,k=0..n-1) ; ilcm(%) ; end: seq(A082736(n),n=1..20) ; # R. J. Mathar, Jul 17 2007

Formula

a(1) = 1, a(2n) = LCM of next 2n even numbers. a(2n+1) = LCM of next 2n+1 odd numbers.

Extensions

More terms from R. J. Mathar, Jul 17 2007