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| A Remark on Chen’s Theorem (Ⅱ) | |
| 作者单位： | Yingchun CAI Department of Mathematics，Tongji University，Shanghai 200092，China. |
| 摘 要： | Let p denote a prime and P2 denote an almost prime with at most two prime factors. The author proves that for suffciently large x,sum from p≤x p 2=P2 1>(1.13Cx)/(log~2x), where the constant 1.13 constitutes an improvement of the previous result 1.104 due to J. Wu. |
| 关 键 词： | Chen’s theorem Sieve Mean value theorem |
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