Yet another J solution. This one has two functions that mutually recursively build the spiral. This one too accepts the size of the spiral as argument. 

spiralh =: (,:@i. , ] + [: |:@|. spirals) ` ((1 0$0)"_) @. (<:&0)
spirals =: ,:@i. , ] + [: |:@|. [: spiralh <:
spiral =: ([: >: spirals)"0
2!:55[0[ 1!:2&2 spiral 5".>{: ARGV

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This is getting addictive, isn't it?

In reply to Re: Spiraling integers by ambrus
in thread Spiraling integers by Elijah

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