41,43,47,53,59,61,67,71,73,79
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41,43,47,53,59,61,67,71,73,79
There are 3 prime numbers from 40 to 50:41, 43 and 47
There are 8 prime numbers between 10 and 40: 11 13 17 19 23 29 31 37.
There are 4 prime numbers between 20 and 40.
1001,1111,1221,1331,1441,1551,1661,1771,1881,1991,2002,2112,2222,2332,2442,2552,2662,2772,2882,2992,3003,3113,3223,3333,3443,3553,3663,3773,3883,3993,4004,4114,4224,4334,4444,4554,4664,4774,4884,4994: 40 numbers in all.
41, 43 and 47 are the prime factors between 40 and 50