Powers of 2
2, 4, 8, 16, 32, 64, 128, 256, 512
There are 168 prime numbers between 1 & 1000.
Since all numbers have one as a factor, there is no number with three as its only factor.
Prime No: between 1000 to 9999= 54_( 42x3)
3,9,27,81,243,729
There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.
1024, 2048, 4096 and 8192
1001
168.
168
168
There are 169.
2, 4, 8, 16, 32, 64, 128, 256, and 512