Here's something quite clever, an apparently psychic website, and the fact that it's a cheap trick doesn't make it any less clever. Odious is a little faster with this sort of thing, and had the key before Peculiar's train of thought was too far out of the station. Here are some clues.
Hint #1 (stimulus): Think about the presence on the chart of numbers like 1 and 99 as solutions to the math. What are they doing there?
Hint #2 (really should be sufficient): Try doing it with a few consecutive numbers.
Hint #3 (insults your intelligence): do the same number a few times in a row.