The numbers in this sequence are decreasing. The term-to-term rule is -5.The next term in the sequence is 11 (16 − 5). Look at the difference between one pattern and the next in the sequence.

The main character in our animations thus far is a boy called Small Number. He is a bright, playful kid, with the ability to recognize patterns and calculate quickly. Other characters introduced so ...

To make progress on one of number theory’s most elementary questions, two mathematicians turned to an unlikely source.