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It blows my mind that HN post submitters don't do a simple spell check on their post titles.

That mistake ‘an’ is in the original blog title. I assume this was posted by the blog author

A simple spellcheck won’t detect it but grammar check might.

Edit: the reason is probably that the writer is saying “eleven hundred”. It sounds OK but looks strange in writing

The "an" is correct, if you read the number as "eleven hundred and fifteen".

Yeah, it's a fun edge case of writing numbers in numeral form... it could be wrong or could be right, depending on how you read the number!