307

307 is the 63rd prime number and an odd prime number.It is an isolated (i.e., not twin) prime,[2] but because 309 is a semiprime, 307 is a Chen prime. 307 is the number of one-sided noniamonds meaning that it is the number of ways to organize 9 triangles with each one touching at least one other on the edge. 307 is the third non-palindromic number to have a palindromic square. 3072=94249. 307 is the number of solid partitions of 7. 307 is one of only 16 natural numbers for which the imaginary quadratic field Q ( − n ) {\displaystyle \mathbb {Q} ({\sqrt {-n}})} has class number 3.