righttruncatable

A right-truncatable prime is a prime number that remains prime when its rightmost digit is successively removed. For example, the number 3797 is a right-truncatable prime because 3797, 379, 37, and 3 are all prime numbers. This concept is a subset of the more general idea of truncatable primes, which includes both right-truncatable and left-truncatable primes.

Right-truncatable primes are of interest in number theory and recreational mathematics. They are typically found among the prime numbers in the decimal system, and their properties have been studied to understand the distribution and behavior of prime numbers. The search for right-truncatable primes often involves computational methods due to the large number of digits involved in some of these primes.

One notable example of a right-truncatable prime is 23, which is the smallest such prime. Other examples include 5939, 3797, and 239, among others. The study of right-truncatable primes can provide insights into the patterns and properties of prime numbers, contributing to the broader field of number theory.