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The primes 47, 257, 467, 677, 887, 1097 and 1307 constitute a progression of 7 terms with a common difference of 210. [Barrow , Bush and Taylor] 210 is the smallest number with 4 distinct prime divisors. The largest singledigit primorial value, 7# = 2 * 3 * 5 * 7 = 210. [Nicholson] It has been estimated that 210 becomes a "jumping champion" at around 10^425. (21, 20, 29) and (35, 12, 37) are the two least primitive Pythagorean triangles with different hypotenuses and the same area (=210). [Sierpinski] The number of distinct representations of a number n as the sum of two primes is at most the number of primes in the interval [n/2, n2], and 210 is the largest value of n for which this upper bound is attained. In other words, 210 is the largest positive integer n that can be written as the sum of two primes in (n  2)  (n/2  1) distinct ways. Reference: An upper bound in Goldbach's problem. [Capelle]
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