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A056147 a(1) = 1, a(m+1) = Sum_{k=1..m} lcm(m, a(k)). 3
1, 1, 4, 18, 48, 360, 450, 6174, 27000, 34200, 93250, 1776566, 11293824, 172014648, 1296688778, 20393895570, 173895132784, 3328106382492, 11622794050422, 287786755919610, 709366149217940, 17019652496034468, 198351459813601270 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..506

EXAMPLE

a(5) = lcm(4,1) + lcm(4,1) + lcm(4,4) + lcm(4,18) = 4 + 4 + 4 + 36 = 48.

MATHEMATICA

Fold[Append[#1, Total@ LCM[#2, #1[[Range@ #2]] ] ] &, {1}, Range@ 22] (* Michael De Vlieger, Dec 11 2017 *)

CROSSREFS

Sequence in context: A052642 A102928 A081528 * A181857 A303737 A180805

Adjacent sequences:  A056144 A056145 A056146 * A056148 A056149 A056150

KEYWORD

easy,nonn

AUTHOR

Leroy Quet, Aug 04 2000

STATUS

approved

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Last modified March 31 03:48 EDT 2020. Contains 333136 sequences. (Running on oeis4.)