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73 is one of the fifteen left-truncatable and right-truncatable primes in decimal, meaning it remains prime when the last "right" digit is successively removed and it remains prime when the last "left" digit is successively removed; and because it is a twin prime (with 71), it is the only two-digit twin prime that is both a left-truncatable and ...
A right-truncatable prime is a prime which remains prime when the last ("right") digit is successively removed. 7393 is an example of a right-truncatable prime, since 7393, 739, 73, and 7 are all prime. A left-and-right-truncatable prime is a prime which remains prime if the leading ("left") and last ("right") digits are simultaneously ...
A prime number (or prime) is a ... 37, 61, 73, 97, 109, 157, 181, 193, 229, 241, 277, 313, 337, 349 ... Primes that are both left-truncatable and right-truncatable ...
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An odd prime number p is defined to be regular if it does not divide the class number of the pth cyclotomic field Q(ζ p), where ζ p is a primitive pth root of unity. The prime number 2 is often considered regular as well. The class number of the cyclotomic field is the number of ideals of the ring of integers Z(ζ p) up to equivalence.
In number theory, a Pierpont prime is a prime number of the form + for some nonnegative integers u and v.That is, they are the prime numbers p for which p − 1 is 3-smooth.They are named after the mathematician James Pierpont, who used them to characterize the regular polygons that can be constructed using conic sections.
This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 32. Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89
How can it be known that there is a bound on the number of truncatable primes? 85.166.78.90 20:03, 2 November 2008 (UTC) []. It's easy to make an exhaustive computer search in base 10 by starting with one-digit primes and trying to add digits to the start (left-truncatable) or end (right-truncatable) while keeping it a prime.