13 17 31 37 71 73 79 97
Mirror primes are pairs of prime numbers whose digits are reversed. (13,31)(17,71)(37,73)(79,97)
11, 13, 17, 31, 37, 71, 73, 79, 97
11 13, 31 17, 71 37, 73 79, 97
There are four pair of mirror primes.
25 primes.
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.
101
Twin primes between 50 and 100 are {59, 61} and {71, 73}.
The only consecutive primes between 1 and 100 are 2 and 3.
2x2x5x5
25 of them.
25 of them.