What does the cryptic crossword clue "Mersenne ultimately enthralled by non-prime numbers too (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Mersenne ultimately enthralled by non-prime numbers too (7)

Times Cryptic #29502 | 20 Down | 2026-03-28 flower

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