Arranging 2N numbers

Hans Havermann hahaj at
Wed Feb 14 00:48:51 CET 2001

> Arrange the numbers 1,1,2,2,3,3,4,4.....15,15,16,16 in such a way that
> there is one number between the ones, two numbers between the twos and
> so on up to 16 so that there are 16 numbers between the 16s.

See "Langford's Problem"

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