307 (number)

In mathematics

• 307 is the 63rd prime number and an odd prime number. It is an isolated prime, 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 has class number 3.