293

293 is : a prime number, a Pythagorean prime, a Sophie Germain prime a Chen prime strictly trivially polygonal (number n that is polygonal in only 2 ways: 2-gonal and n-gonal) equivalent to the sum of the first three tetradic primes. Tetradic numbers are numbers that are the same if written backwards, flipped upside-down, or mirrored upside-down and tetradic primes are tetradic numbers that are also prime. It is the sum of 11 + 101 + 181. the sum of perfect cubes 2³+2³+3³+5³+5³