291

291 is an odd composite number with two prime factors. 291 is a semiprime number meaning that it has 2 prime factors. 291 can be written as the sum of the nth prime plus n. It is the 52nd prime (239) plus 52. 291 is one of the positions of “c” in the tribonacci word abacabaab… defined by a->ab, b->ac, c->a. 291 is the sum of six 4th powers. It is the sum of 4⁴+2⁴+2⁴+1⁴+1⁴+1⁴.