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At 01:56 PM 2/25/2003, you wrote:
What I meant was, Let a prime be a good prime if a digit can be deleted leaving either the empty string or a good prime.
What I meant was,
Let a prime be a good prime if a digit can be deleted leaving either the empty string or a good prime.
I think this is one of the problems or puzzles at www.primepuzzles.net, but I'm not sure.
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