2020

This number is a composite.

Just showing those entries submitted by 'Gaydos': (Click here to show all)

For three composite years y-1, y, and y+1 the prime factorization of y has no digits in common with the prime factorizations of y-1 or y+1 for y=2020. The last three years with this property were 1815, 1935, and 2019. The next three such years will be 2045, 2049, and 2065. [Gaydos]