There are 24 sets.
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
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The prime numbers (factors) of 500 are: 2 and 5
503 509 521 523 541 547 557 563 569 571 577 587 593 599
The prime numbers between 401 and 500 are: 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499
The prime factors are: 2, 5
You'll need five. 2 x 2 x 5 x 5 x 5 = 500