Farm DogTrick brain teasers appear difficult at first, but they have a trick that makes them really easy.The numbers 2 and 5 are the only two prime numbers that end in 2 or 5. What is the rationale for the following groups of numbers?
3 17 31 47 61 7 19 37 49 67 11 23 41 53 71 13 29 43 59 73 What Next?
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