"Crontab -e Returns a Number" Problem

I sometimes find on a certain machine that when I change to a bash shell and try to edit the crontab with

# crontab -e

instead of getting my vi editor I just get a number returned, for example:

# crontab -e

Obviously something to do with how the default editor is set in the root csh profile then moving to bash. It is fixed with:

 export EDITOR
 crontab -e

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