+1768 We call a number cozy if every digit in the number is either even or next to an even digit. For example, a number is cozy if every digit in the number is either a 2 or next to a 2. For example, the number 222, 72, 45, and 810 and are all cozy. Also, the numbers 202 and 2772 are cozy.
How many 4-digit numbers are cozy?
