已知递增的等差数列{an}满足a1=1,a3=a2-4,则an=____.

已知递增的等差数列{an}满足a1=1,a3=a2-4,则an=____. 已知递增的等差数列{an}满足a1=1，a 已知递增等差数列｛an｝满足：a1=1,且a1,a2.a4成等比.（ 已知递增的等差数列(AN)满足A1＝1.A3＝A2的平方-4.则AN＝ 已知数列{an}满足a1=4,an+1=an+p.3^n+1(n属于N+,P为常数）,a1,a2+6,a3成等差数列. 已知单调递增的等比数列{an}满足a2+a3+a4=28,且a3+2是a2,a4的等差数列,求bn=9+log1/2an 已知各项都为正数等比数列的{an}中,a2*a4=4 ,a1+a2+a3=14 则满足an+an+1+an+2>1/9最 已知各项都为正数等比数列的{an}中,a2+a4=4 ,a1+a2+a3=14 则满足an+an+1+an+2>1/9最 已知等差数列{an}为递增数列,满足a3²=5a1＋5a5,在等比数列{bn}中,b3=a2＋2,b4=a3＋ 1.已知单调递增的等比数列{an}满足a1+a2+a3=39,且a2+6是a1,a3的等差中项. 递增等差数列an满足a1=1,a1,a2,a3为等比数列.设bn=an+2的an次方,求数列bn的前n向和sn 等差数列{an}中,已知a1=1\3,a2+a3=4,an=33试求n的值