grenv:
OK if you all English-language-people have learnt that the use of "a" makes the statement: "does he have a pencil?" the same with "does he have at least a pencil?" then i didn't know that or seen this before.....

But really it's a matter of definition again.
It is not obvious for me to define the:
"I have a pencil."
as:
"I have at least a pencil."
instead of the more logical:
"I have exactly one pencil."