90000以內(nèi)有17261個(gè)類質(zhì)數(shù)10^10以內(nèi)有1918081917個(gè)類質(zhì)數(shù)10^100以內(nèi)大約有1.9180819181*10^99個(gè)類質(zhì)數(shù)----------------------簡(jiǎn)解----------------------------------2,3,5,7,11,13的最小公倍數(shù)是2*3*5*7*11*13=3003...為什么會(huì)知道1-30030有5760個(gè)類質(zhì)數(shù)呢？可以用excel篩選如果要列算式,就是:30030-30030/2-30030/3-30030/5-30030/7-30030/11-30030/13+30030/(2*3)+30030/(2*5)+30030/(2*7)+30030/(2*11)+30030/(2*13)+30030/(3*5)+30030/(3*7)+30030/(3*11)+30030/(3*13)+30030/(5*7)+30030/(5*11)+30030/(5*13)+30030/(7*11)+30030/(7*13)+30030/(11*13)-30030/(2*3*5)-30030/(2*3*7)-30030/(2*3*11)-30030/(2*3*13)-30030/(2*5*7)-30030/(2*5*11)-30030/(2*5*13)-30030/(2*7*11)-30030/(2*7*13)-30030/(2*11*13)-30030/(3*5*7)-30030/(3*5*11)-30030/(3*5*13)-30030/(3*7*11)-30030/(3*7*13)-30030/(3*11*13)-30030/(5*7*11)-30030/(5*7*13)-30030/(5*11*13)-30030/(7*11*13)+30030/(2*3*5*7)+30030/(2*3*5*11)+30030/(2*3*5*13)+30030/(2*3*7*11)+30030/(2*3*7*13)+30030/(2*3*11*13)+30030/(2*5*7*11)+30030/(2*5*7*13)+30030/(2*5*11*13)+30030/(2*7*11*13)+30030/(3*5*7*11)+30030/(3*5*7*13)+30030/(3*5*11*13)+30030/(3*7*11*13)+30030/(5*7*11*13)-30030/(2*3*5*7*11)-30030/(2*3*5*7*13)-30030/(2*3*5*11*13)-30030/(2*3*7*11*13)-30030/(2*5*7*11*13)-30030/(3*5*7*11*13)+30030/(2*3*5*7*11*13)= -10331+12673+5112+1866+930-2556-933-360-105-622-240-70-144 -42-30+311+120+35+72+21+15+48+14+10+6-31-10+1=5760