21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many numbers are in the list $$ 6,10,14,\ldots,82,86? $$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
21
How many numbers are in the list $$ 6,10,14,\ldots,82,86? $$
train