1 and 17.
Both 17 and 21 go into their least common multiple (LCM), which is 357. Additionally, they both divide evenly into any multiple of 357, such as 714 or 1071. Moreover, they can also be factors of certain expressions or equations where they share common multiples.
340 = 20 x 17 357 - 340 = 17 17 times with 17 remaining
1, 3, 7, 17, 21, 51, 119, 357.
21 times.
Only the number 1.
Themselves and their multiples because 17 and 13 are both prime numbers.
The lowest possible number? Or just a number? A easy method would be to just multiply 17 & 19 17 X 19 = 323
Quite a few. However the most obvious is 17*22 = 374.
It is their lowest common multiple which is 221 13 and 17 are both prime numbers
136, 272, 408, 544, 680 +136 . . .
1 and 17 (17 is a prime number).
17 is prime and 68 is 17 times 4, so the number that can go into 17 and 68 is 17.