Question

将一个正整数nl输入一台机器内产生n(n+1)/2的个位数字。若输入a产生的数字记为a1;输入a1产生的数字记为a2;

将一个正整数nl输入一台机器内产生n(n+1)/2的个位数字。若输入a产生的数字记为a1;输入a1产生的数字记为a2;......;依此类推。现a=2,a2010=?

Answer 1

将一个正整数nl输入一台机器内产生n(n+1)/2的个位数字。若输入a产生的数字记为a1;输入a1产生的数字记为a2;......;依此类推。
a = 2
a1 = 2*3/2 = 3
a2 = 3*4/2 = 6
a3 = 21
a4 = 1*2/2 = 1
a2010 = 1

Answer 2

a = 2
a1 = 2*3/2 = 3
a2 = 3*4/2 = 6
a3 = 6*7/2 个位= 1
a4 = 1*2/2 = 1
a5 = 1*2/2 = 1
……
a3及以后的a[i] 均等于1
a2010 = 1

Answer 3

a = 2
a1 = 2*3/2 = 3
a2 = 3*4/2 = 6
a3 = 21
a4 = 1*2/2 = 1
a2010 = 1
参考
czsx.cooco.net.cn/testdetail/28108/

Answer 4

a2010 = 1