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The largest holey prime less than a googol. [Patterson] The largest prime less than a googol whose digits contain circles, i.e., using only the digits 0, 6, 8, 9. [Patterson and Honaker] The largest prime less than a googol and containing only nonprime digits. [Gupta] The largest Happy prime less than a googol. [Gupta] The largest prime less than a googol and containing only curved digits. [Gupta]
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