11, 13, 17, 31, 37, 71, 73, 79, 97
The odd primes less than 20 are: 3 5 7 11 13 17 19
There are 8 twin primes less than 100. 3,5 : 5,7 : 11,13 : 17,19 : 29,31 : 41,43 : 59,61 : 71,73
In any large range of numbers, more so the higher and larger the range is, there will be more composites than primes. It is far more likely that a given number will be divisible by some number less than the number itself, the higher you go.
5, 7, 13, 17 and 19 can be so written.
Just 7. Any other number divisible by 7 isn't prime.
There 25 primes less than 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.
The odd primes less than 20 are: 3 5 7 11 13 17 19
59 and 53 are the two largest primes less than 60. 59+53 = 112
There are 168 prime numbers less than 1,000.
37 and 79
There are 8 twin primes less than 100. 3,5 : 5,7 : 11,13 : 17,19 : 29,31 : 41,43 : 59,61 : 71,73
here are all 8, 3,5 11,13 17,19 59,61 29,31 41,43 5,7 71,73
The median of the 12 primes less than 40 is 15.
eight (8)
google / 1000 primes
9.
There are only 3 numbers to test if they are prime, that isn't very hard. You can also use the list of 1000 smallest primes.