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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 two-digit primes less than 50 are 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47. For each prime on this list whose tens digit is odd, check whether or not the number formed when the digits are reversed is also prime. (Note that if the tens digit is even, then the ``reversed'' number is even and hence not prime.) The palindromic primes less than 50 are 11, 13, 17, 31, and 37, whose sum is 109.
The odd primes less than 20 are: 3 5 7 11 13 17 19
11, 13, 17, 31, 37, 71, 73, 79, 97
59 and 53 are the two largest primes less than 60. 59+53 = 112
There are 5,761,455 primes less than 100,000,000. The largest of which is 99,999,989.
There are 168 prime numbers less than 1,000.
37 and 79
here are all 8, 3,5 11,13 17,19 59,61 29,31 41,43 5,7 71,73
There are 8 twin primes less than 100. 3,5 : 5,7 : 11,13 : 17,19 : 29,31 : 41,43 : 59,61 : 71,73
The median of the 12 primes less than 40 is 15.
eight (8)