20201231
This number is a prime.
The largest prime date in 2020 using the format yyyymmdd. New Year's Eve! [Rivera]
20201231 and 20210101 (New Year's Eve and New Year's Day) are both primes. The next such dates are 20291231 and 20300101; the only two such dates in this century using the format yyyymmdd. [Xayah]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell