20261

This number is a prime.

+ The smallest five-digit prime ABCDE for which the all of the following are also prime: ABCD + E; ABC + DE; AB + CDE; A + BCDE; AB + CD + E; A + B + C + D + E. [Kilpatrick]

(There is one curio for this number that has not yet been approved by an editor.)

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell