1,2,3,5,7,9,11,13,17,19
The square numbers between 1 and 20 are 1,4,9 and 16.
All whole numbers between 1 and 400 (=20 square).
There are 167960 9 digits combinations between numbers 1 and 20.
There are (not counting 1) three square numbers between 1 and 20.
There are 8 prime numbers between 1 and 20. The numbers are 2, 3, 5, 7, 11, 13, 17, and 19.
1, 2, 4, 5, 10, 20
20 of them.
There are eleven of them including 20
1
There are 31 perfect square numbers between 1 and 1000 (including 1).
Just 6
The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19.