#Mathematica 14 12 bytes

Since built-ins are allowed, this should do it.

FindClusters

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}

Mathematica 14 12 bytes

Since built-ins are allowed, this should do it.

FindClusters

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}

#Mathematica 14 12 bytes

Since built-ins are allowed, this should do it. (I'm not sure the brackets need to be counted.)

FindClusters

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}

#Mathematica 14 12 bytes

Since built-ins are allowed, this should do it.

FindClusters

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}

#Mathematica 14 bytes

Since built-ins are allowed, this should do it. (I'm not sure the brackets need to be counted.)

FindClusters[]

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}

#Mathematica 14 12 bytes

Since built-ins are allowed, this should do it. (I'm not sure the brackets need to be counted.)

FindClusters

Example

FindClusters[{{4, 8}, {15, 16}, {23, 42}, {-13.37, -12.1}, {666, -666}}, 3]

{{{4, 8}, {-13.37, -12.1}}, {{15, 16}, {23, 42}}, {{666, -666}}}