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72 arithmetic/digits/prime/all.prefix.p |
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72 arithmetic/digits/prime/all.prefix.p |
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This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
What is the longest prime whose every proper prefix is a prime?
arithmetic/digits/prime/all.prefix.s
23399339, 29399999, 37337999, 59393339, 73939133
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