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思考？
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找规律填数： 2 、 3 、 5 、 7 、 11 、 13 、 17 、 19 、 ?. 思考？. 23. 质数：只有 1 和本身两个约数. 2311. 12347. 510511. 30031. =59×509. =19×26869.
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思考？
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找规律填数： 2、3、5、7、11、13、17、19、? 思考？ 23 质数：只有1和本身两个约数 2311 12347 510511 30031 =59×509 =19×26869
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