|
|
A131120
|
|
a(1)=1. a(n+1) = n!/lcm(a(1),a(2),...,a(n)).
|
|
2
|
|
|
1, 1, 2, 3, 4, 10, 12, 84, 96, 108, 120, 1320, 1440, 18720, 20160, 151200, 483840, 1028160, 1088640, 2298240, 2419200, 50803200, 159667200, 1836172800, 1916006400, 11975040000, 12454041600, 336259123200, 348713164800
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
LINKS
|
|
|
EXAMPLE
|
The LCM of the first 7 terms is 60. So a(8) = 7!/60 = 84.
|
|
MAPLE
|
|
|
MATHEMATICA
|
nxt[{a_, n_, lst_}]:=Module[{l2=lst, x=(n+1)!/LCM@@lst}, {x, n+1, AppendTo[ l2, x]}]; Transpose[NestList[nxt, {1, 0, {1}}, 30]][[1]] (* Harvey P. Dale, Jun 07 2014 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|