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补充筛法求约数个数
author
ljfcnyali
<ljfcnyali@gmail.com>
Fri, 30 Aug 2019 00:16:45 +0000
(08:16 +0800)
committer
ljfcnyali
<ljfcnyali@gmail.com>
Fri, 30 Aug 2019 00:16:45 +0000
(08:16 +0800)
docs/math/sieve.md
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a/docs/math/sieve.md
b/docs/math/sieve.md
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--- a/
docs/math/sieve.md
+++ b/
docs/math/sieve.md
@@
-134,7
+134,7
@@
void pre() {
定理:若 $n=\prod_{i=1}^mp_i^{c_i}$ 则 $d_i=\prod_{i=1}^mc_i+1$
-证明:我们知道 $p_i^{c_i}$ 的约数有 $p_i^0,p_i^1,\
c
dots ,p_i^{c_i}$ 共有 $c_i+1$ 个,根据乘法原理, $n$ 的约数个数就是 $\prod_{i=1}^mc_i+1$
+证明:我们知道 $p_i^{c_i}$ 的约数有 $p_i^0,p_i^1,\dots ,p_i^{c_i}$ 共有 $c_i+1$ 个,根据乘法原理, $n$ 的约数个数就是 $\prod_{i=1}^mc_i+1$
#### 实现