3,5
5,7
11,13
17,19
29,31
41,43
59,61
71,73
101,103
107,109
137,139
149,151
179,181
191,193
197,199
227,229
239,241
269,271
281,283
311,313
347,349
419,421
431,433
461,463
521,523
569,571
599,601
617,619
641,643
659,661
809,811
821,823
827,829
857,859
881,883
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Nobody invented them - they are a characteristic of the set of numbers.
41 and 43 are twin prime numbers. Twin primes are a set of two prime numbers that differ from each other by two. Here are the sets of twin primes less than 100: (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
It is the set {2}.
19
The 20th prime is 71.