A119944 First differences of A003418(n) = lcm(1..n).

0, 1, 4, 6, 48, 0, 360, 420, 1680, 0, 25200, 0, 332640, 0, 0, 360360, 11531520, 0, 220540320, 0, 0, 0, 5121436320, 0, 21416915520, 0, 53542288800, 0, 2248776129600, 0, 69872686884000, 72201776446800, 0, 0, 0

Offset

0,3

Comments

a(n)=0 iff n=0 or n = n(k) = A080765(k), k >= 1.

Links

Table of n, a(n) for n=0..34.

Formula

a(n) = A003418(n+1) - A003418(n), n >= 0. A003418(0):=1.

Mathematica

Differences[FoldList[LCM, 1, Range[40]]] (* Harvey P. Dale, Jan 09 2016 *)

Crossrefs

Sequence in context: A013166 A174653 A274215 * A338814 A134592 A306705

Adjacent sequences: A119941 A119942 A119943 * A119945 A119946 A119947

Keyword

nonn,easy

Author

Wolfdieter Lang, Jul 20 2006

Status

approved