There are 6468 pearls in a pile. If you take a prime number of pearls each time, you will finish them after a certain number of times. There are a different ways to take them; a+b=how much (the number of pearls is the same each time)
一堆珍珠共6468颗，若每次取质数颗，若干次后刚好取完，不同的取法有a种；若每次取奇数颗，若干次后刚好取完，不同的取法有b种，则a+b=多少(每次取珍珠的颗数相同)
<gadget id="calculator">4 + 9</gadget>
<output>13</output>

<result>13</result>