LargestRepeatedPart on IntegerPartition

The largest part that occurs at least twice; 0 if the parts are distinct.

On IntegerPartition

Called as CombinatorialStat(x, "LargestRepeatedPart"). The head's page has its examples.

Live

FindStat St000143

The largest repeated part of a partition.

Object	Value
`[]`	`0`
`[1]`	`0`
`[2]`	`0`
`[3]`	`0`
`[4]`	`0`
`[5]`	`0`
`[6]`	`0`
`[7]`	`0`

Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000143 has the rest.