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It considers the connection between perfect numbers and Mersenne primes ( known as the Euclid–Euler theorem ) , the infinitude of prime numbers , Euclid 's lemma on factorization ( which leads to the fundamental theorem of arithmetic on uniqueness of prime factorizations ) , and the Euclidean algorithm for finding the greatest common divisor of two numbers .
 Mersenne, Euclid–Euler, Euclid, Euclidean
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mersenne, Euclid–Euler, Euclid, Euclidean