There are many. Her is one:
1 + 4 - 5 - 7 + 9 + 11 = 13
2, 3, 13 2, 5, 11
1+25, 3+23, 5+21, 7+19, 9+17, 11+15 or 13+13 !
11, 13, 17, and 19
All numbers except primes themselves can be written as a multiple of two or more primes. So you just need to try dividing the number by prime numbers. Trying 13 gives 1001 = 13*77 = 13*7*11. 13, 7 and 11 are all prime numbers, so you know you have found the unique prime factorization of 1001.
None of the numbers 7, 11, and 13 are composite numbers; they are all primes.
11 and 13 are prime numbers because they have only 2 factors which are themselves and one.
13 x 1
11 and 13 are both prime numbers.
There are three modes: 11, 12 and 13
The least common multiple of the numbers 11, 12 and 13 is 1,716.
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors