287

287 is an odd composite number with 2 prime factors. 287 is the sum of consecutive primes in three different ways, 89+97+101, 43+53+59+61+67, and 17+19+23+29+31+37+41+43+47 287 is a pentagonal number which follows the concept of triangular numbers. 287 is an odd semiprime number. 287 is the sum of exactly 4 nonzero squares. 287 is a number where 2(287)-1 and 2(287)+1 are both prime