326 is the maximum number of regions into which 25 lines divide a plane (A000124).
326 is the number of permutations of some subset of five elements (A000522).
326 is the sum of 14 consecutive primes: 326 = 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47.
326 is a number n such that n and n + 1 (327) are semiprimes (A070552) and have the same number of divisors (A005237).
The sum of the first 326 primes is a prime (A013916).
Source: What's Special About This Number?
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