2025 is the only year in the 21st century that is the sum of a squared number, that number being 45.

The last year to be the sum of a squared number was 1936, and a squared number year will not occur again until 2116, which will be around the time Mick Jagger and Keith Richards contemplate retirement.

So yes, to us elderly people that won’t make it to the 22nd century, unless they invent the heads in jars from Futurama, enjoy this once in a lifetime square number year.