What is the largest number that can be made up of 1, 2, 3?

In ancient Greece, numbers like 6,28 are called perfect numbers. Such numbers are the sum of all factors (except itself), and which numbers can be "perfect" like 6 or 28? I think the 21st power of 6 is larger and more complete than that of 3. The 21st power of 3 is just

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1. What is the maximum number of 1, 2 and 3? There are only three numbers, no other symbols
2. How many numbers can be made up of numbers 1, 2, 3
3. How many numbers can be composed of numbers 1, 2 and 3 without repeating numbers
4. What is the maximum number of 1,2,3
5. The four numbers 3.5 14 28 7 make up different proportions
6. Put the four numbers in each group into different proportions (write two each) (1) 3.5 14 28 7 (2) 1 / 4 1 / 5 2.4 3
7. Can 2, 3, 4 and 5 form a proportion
8. What are the ways to match 2, 4 and 8 with a number to form a proportion?
9. The proportion of 3 / 4,5 / 4,2 with a number
10. Put 1,2,3,4,. 5,6,7,8,9 in the nine blanks of the five Olympic rings, so that the sum of the numbers in each circle is equal to 13. How to fill in? The process should be detailed How to determine the four overlapping numbers, 1 + 2 + 3 + 4... + 9 = 65 13 * 5 = 45 65-45 = 20 what do you do next?
11. There are three numbers: 3, 5 and 10. Add another number and the proportion is ()
12. Add one of the three numbers 2,5,1 / 3 to form a proportion and write down all possible situations
13. Add another number to 2,5,1 / 3 to form a proportion, and write down all possible situations
14. Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()
15. Only use 2, 3, 4 and 5 to form a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed
16. The largest number is 2, 3, 4, 7 and 5______ The minimum number of components is______ ．
17. 2. 3, 4 and 5 make up a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed, and 5432,42 ^ 53. Please use "^" for power calculation, such as 2 ^ 8 for the 8th power of 2.)
18. Select four numbers from 3 / 8, 3 / 4, 1.6/7 and 0.8 to form the proportion ()
19. Judgment: four ratios can be made up of three, four, six and eight
20. 4 0.125 2.58 make these four numbers into different proportions (only two groups)