19160621
This number is a prime.
The first member of the prime quadruplets of the form YYYYMMDD for the 20th century (19160621, 19160623, 19160627,
19160629). There are two more prime quadruplets in that century, namely (19530101, 19530103, 19530107, 19530109) and (19960511, 19960513, 19960517, 19960519). [Roshanak]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell