Hacker News Reader

"an HN" is right if HN is meant to be read "aitch en." The a/an rule is based on phonetics.

And to your question, I guess not. :P

The pronunciation is "hacker news", not "acker news", therefore "a" and not "an". The consonant is pronounced, not silent.

Edit: oh, that's not german you wrote. You're right about "H N"