Open Middle®
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make 5 prime numbers.
Hint
What numbers should not go in the one’s place?
What are the single digit prime numbers?
What are the single digit prime numbers?
Answer
Number of Unique Solutions: 8
1: 2, 41, 53, 67, 89
2: 2, 41, 59, 67, 83
3: 2, 47, 53, 61, 89
4: 2, 47, 59, 61, 83
5: 5, 23, 41, 67, 89
6: 5, 23, 47, 61, 89
7: 5, 29, 41, 67, 83
8: 5, 29, 47, 61, 83
1: 2, 41, 53, 67, 89
2: 2, 41, 59, 67, 83
3: 2, 47, 53, 61, 89
4: 2, 47, 59, 61, 83
5: 5, 23, 41, 67, 89
6: 5, 23, 47, 61, 89
7: 5, 29, 41, 67, 83
8: 5, 29, 47, 61, 83
Source: Owen Kaplinsky
7,17,13,37,47
3
2,41,53,67,89
5, 61, 23, 47, 89
3, 11, 13, 17, and 19 are all prime.
7 17 13 37 47
7, 17, 13, 19, 37.
0,23,41,57,89
2,13,41,97,89
7,56,83,41,29
1, 23, 46, 57, 89
5, 29, 47, 61, 83
1: 2, 41, 53, 67, 89
2: 2, 41, 59, 67, 83
3: 2, 47, 53, 61, 89
4: 2, 47, 59, 61, 83
5: 5, 23, 41, 67, 89
6: 5, 23, 47, 61, 89
7: 5, 29, 41, 67, 83
8: 5, 29, 47, 61, 83
Prime numbers I can make are 5,12,6,2,and 67
The prime numbers I found are 5,29,47,61,83.
I got 5,29,47,61,83
2 3 5 7 11
2,41,89,53,67
5,29,47,61,83
2, 51, 47, 69, 23
its 3,6,77,8,1
its 3,6,77,8,1,48327534687
2, 41, 53, 67, 89 are another answer set
2,47,53,61,89