题目内容
一个质数p,使得p+2,p+4同时都是质数,则
+
+
=______.
| 1 |
| p |
| 1 |
| p+2 |
| 1 |
| p+4 |
根据题干分析可得:
这三个质数分别是:3,5,7,
+
+
,
=
+
+
,
=
,
则
+
+
=
,
故答案为:
.
这三个质数分别是:3,5,7,
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
=
| 35 |
| 105 |
| 21 |
| 105 |
| 15 |
| 105 |
=
| 71 |
| 105 |
则
| 1 |
| p |
| 1 |
| p+2 |
| 1 |
| p+4 |
| 71 |
| 105 |
故答案为:
| 71 |
| 105 |
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