The number of primes and the number of semiprimes up to 33
are equal. [Gupta]
The smallest run of 3 consecutive integers that are semi-primes (the product of two primes) begins with 33. [Wells]
The smallest palindromic number n such that inserting a digit '1' between adjacent digits of n is prime. [Russo]
33^33 - 33! + 33*33 - 33/33 is a 51-digit prime. [Firoozbakht]
First exponent to yield 3 generalized cullen primes:
33*4^33+1, 33*14^33+1 and 33*34^33+1 [Chun Wa]
The smallest triadic semiprime. [Capelle]
The largest known number (coincidentally semiprime) that is
not the sum of two semiprimes. [Capelle]
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