1 and 2.
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Prime factorization of 26 makes it much clear. 26 = 2x13. Both 13 and 2 go into 26.
These numbers: 1, 2, 4, 13, 26, 52.
Highest prime factor in 58 is 29 and that in 26 is 13. But there is no highest common factor for 58 and 26.
That's an infinite list. Zero is on it.
All composite numbers can be expressed as unique products of prime numbers. This is accomplished by dividing the original number and its factors by prime numbers until all the factors are prime. A factor tree can help you visualize this. Example: 58 58 Divide by two. 29,2 Stop. All the factors are prime. 2 x 29 = 58 That's the prime factorization of 58.