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, … .

Submitted: 2022-04-01 11:05:22; Last Modified: 2023-10-14 20:45:52.