39

This number is a composite.

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The smallest Sloof Lirpa prime. A Sloof Lirpa (April Fools spelled backwards) prime is an April Fools prime that results in a different April Fools prime when its decimal digits are reversed. The sequence begins 39, 93, 117, 123, 129, 143, 147, 153, 159, 169, 177, 183, 187, 189, 309, 319, 321, 327, 329, 339, 341, 351, 357, 369, 381, 387, 399, 711, 723, 729, 741, 753, 759, 771, 781, 783, 789, 903, 913, … .

Submitted: 2022-04-01 11:05:22; Last Modified: 2022-04-02 00:33:38.