91

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91 = prime(4) × prime(6) is the digit reversal of prime(8), where 4, 6, 8 are consecutive even numbers and prime(4), prime(6), prime(8) = 7, 13, 19 form a sexy prime triplet. [Ahmed]

Submitted: 2026-06-14 16:54:20; Last Modified: 2026-06-14 17:32:26.