Numere prime:
De la 1 la 100
- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
De la 101 la 200
-101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199
...........................
De la 901 la 1000
-907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
-2 este singurul numar par prim.
Numere compuse:
25=5•5
49=7•7
64=8•8
100=10•10
500=10•50
Si asa mai departe.