/usr/include/dovecot/primes.h is in dovecot-dev 1:2.2.9-1ubuntu2.
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1 2 3 4 5 6 7 8 | #ifndef PRIMES_H
#define PRIMES_H
/* Returns a prime close to specified number, or the number itself if it's
a prime. Note that the returned value may be smaller than requested! */
unsigned int primes_closest(unsigned int num) ATTR_CONST;
#endif
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