Professor Clodbottle, inventor and master of all things Habitarium, was running an experiment to see just how many P3s he could fit into his latest model. (The Cogbottle Ninety™, if you're curious. Not yet ready for release, but he's making progress!)
The professor, looking dapper.
On the first day, the professor started with a Pinchit, a Larnikin, and a Mootix. The next day, there were three Pinchits, two Larnikins, and still one very lonely Mootix. He was off to a good start, though, or so he thought.
The following day, the professor noticed he'd only gained one Mootix. Not one to be dismayed, he set some nesters to work and the fourth day saw an increase of four Pinchits! Four!
Another lull came the next day, when only one Larnikin had been added, but things got better the day after that when he found three more Mootixes, another Larnikin, and one more Pinchit.
How many Petpetpets did the professor have in his new Habitarium on the fifteenth day?
Submit the answer without spaces or punctuation or you will be disqualified!