20212223242526272829
This number is a prime.
2021222324 2526272829
The only prime formed from all two-digit integers with the
same first digit. [Silva]
The month of February in a leapyear is the only one whose
last ten days can be written in the form of a prime string:
20212223242526272829. [Silva]
(There are 2 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell