# Mistake in the Algorithm Design Manual?

Look at this excerpt from the Algorithm Design Manual by Skiena, 2nd Edition

The sum of the first $n$ even integers? Surely, the two sums given do not include only even numbers, right? Is this a mistake on the author's part, or am I missing something?

• Looks like a mistake, yes. Either they wanted to use $2i$, which simplifies to 2 * what they write then. Or, the "even" should not be in the sentence. I consider the second more likely since the second half of the sentence doesn't make sense for only even integers, either. – Raphael Oct 12 '17 at 10:35
• What's intended is "The sum of the first even $n$ integers ... ". As written, it's in error. – Thumbnail Oct 12 '17 at 17:31