A058346 a(1) = 1; a(n+1) = LCM( sum{k=1 to n}[a(k)], (product{k=1 to n}[a(k)])*(sum{k=1 to n}[1/a(k)]) ).

1, 1, 2, 20, 408, 2249424, 1098000299233152, 1361974282591521291068503774196960256

Offset

1,3

Links

Table of n, a(n) for n=1..8.

Example

a(4) = LCM(1 +1 +2, 1 *1 *2 *(1 +1 +1/2)) = LCM(4, 5) = 20.

Crossrefs

Sequence in context: A090309 A002116 A393956 * A165554 A393750 A366447

Adjacent sequences: A058343 A058344 A058345 * A058347 A058348 A058349

Keyword

nonn

Author

Leroy Quet, Dec 14 2000

Status

approved