238 (number)

238 (two hundred [and] thirty-eight) is the natural number following 237 and preceding 239.

238 is an untouchable number. There are 238 2-vertex-connected graphs on five labeled vertices, and 238 order-5 polydiamonds (polyiamonds that can partitioned into 5 diamonds). Among the 720 permutations of six elements, exactly 238 of them have a unique longest increasing subsequence.