👉 In mathematics, a semivisible number is a natural number that can be expressed as a sum of two or more primes. In other words, it is a number that is divisible by exactly one prime (the "prime factor"), but not by any higher powers of these primes. For example: - 23571 is a semivisible number because 2 + 3 + 5 + 7 + 1 = 18 and 18 has no other prime
