题目内容
设p,q均为自然数,且
=1-
+
-
+
-…-
+
,求证:29|p.
| p |
| q |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 18 |
| 1 |
| 19 |
证明:注意到29是质数.令a=10×11××19.
=1-
+
-
+
-…-
+
,
=(1+
+
+
+…+
)-2(
+
+…+
),
=(
+
+…+
)-(1+
+…+
),
=
+
+…+
,
=(
+
)+(
+
)+…+(
+
),
=29(
+
+…+
),
∴ap=29q•b,
其中b=a(
+
+…+
)是整数,
∵29|a•p,29是质数,29|a.
∴29|p.
| p |
| q |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 18 |
| 1 |
| 19 |
=(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 19 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 18 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 19 |
| 1 |
| 2 |
| 1 |
| 9 |
=
| 1 |
| 10 |
| 1 |
| 11 |
| 1 |
| 19 |
=(
| 1 |
| 10 |
| 1 |
| 19 |
| 1 |
| 11 |
| 1 |
| 18 |
| 1 |
| 14 |
| 1 |
| 15 |
=29(
| 1 |
| 19×10 |
| 1 |
| 11×18 |
| 1 |
| 14×15 |
∴ap=29q•b,
其中b=a(
| 1 |
| 10×19 |
| 1 |
| 11×18 |
| 1 |
| 14×15 |
∵29|a•p,29是质数,29|a.
∴29|p.
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