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The smallest increasing concatenation of 1^1 then 2^2 then...then n^n that is prime, starting with 1. [Patterson]

The smallest prime starting with a composite number and followed by its prime factors. [Firoozbakht]

There are exactly 1427 amicable pairs whose members have ten or less digits. Note that 1427 itself belongs both to a twin prime pair (1427, 1429) and to a cousin prime pair (1423, 1427). [Beedassy]

The admission number of the celebrated French poet Arthur Rimbaud to the "Hôpital de la Conception" (Marseille), where he had the right leg amputated for osteosarcoma. [Olry]