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                                                 11111 1888118881 1888111111
+

        1 1 1 1 1
        1 8 8 8 1
        1 8 8 8 1
        1 8 8 8 1
        1 1 1 1 1

The only strobogrammatic and tetradic square-congruent prime of order 5. [Ward]

(There is one curio for this number that has not yet been approved by an editor.)




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