What does the cryptic crossword clue "Basic textbooks right to be adopted by 3, 5 and 13? (7)" mean?

The wordplay uses a container (one word inside another). R (synonym="right") in PRIMES (synonym=""3,5 and 13" all being examples of PRIME numbers") = PRIMERS The answer is PRIMERS.

Basic textbooks right to be adopted by 3, 5 and 13? (7)

Guardian Cryptic #29395 | 12 Across | 2024-05-29 flower

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