偶数1020:
{Pr}={3,5,7,11,13,17,19,23,29,31},r=10
3|1020,m1=340/510
5|1020,m2=272/340
7|/1020,m3=196/272
11|/1020,m4=166/196
13|/1020,m5=141/166
17|1020,m6=131/141
19|/1020,m7=116/131
23|/1020,m8=108/116
29|/1020,m9=106/108
31|/1020,m10=104/108
根据崔坤真值公式:r2(N)=(N/2)∏mr
r2(1020)
=(1020/2)*m1*m2*m3*m4*m5*m6*m7*m8*m9*m10
=510*340/510*272/340*196/272*166/196*141/166*
131/141*116/131*108/116*106/108*104/108
=104
1019∈p
r2(1020)=104-2=102为真
r2(1020)=102