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133999337137 (another Prime Pages' Curiosity) |
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The smallest prime consisting of all digits d in
which multidigit primes end (viz., 1, 3, 7, 9) that remains
prime when any pair of the digits d used are
interchanged:
311999117317 (1
<-> 3);
733999331731 (1
<-> 7);
933111337937 (1
<-> 9);
177999773173 (3
<-> 7); 199333997197 (3
<-> 9);
133777339139 (7
<-> 9). [Beedassy]
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