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Talk:Truncatable primes: Difference between revisions
→redefinition of truncatable primes: added comment about truncatable primes in base ten. -- ~~~~
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(→redefinition of truncatable primes: added comment about truncatable primes in base ten. -- ~~~~) |
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:Hi Gerard, there is nothing in the task description implying a base at all and so usually we mean base ten. People talk about "the prime numbers" meaning the prime numbers in base ten without having to explicitly mention it and without confusion. You're not incorrect, (sorry about the double negative); but is it necessary. --[[User:Paddy3118|Paddy3118]] 18:38, 12 September 2012 (UTC)
:: It's not the base of the prime number(s) per se, but when the description mentions taking the right- (or left-most) digits, those digits (in the case of truncatable primes) are specific to base ten. Prime numbers are prime in any (positive integer) base. Taking '''a''' digit from that expression of a prime requires specifying a base in this context. Indeed, there are only 83 right-truncatable primes in base ten, and 4,260 left-truncatable primes in base ten. -- [[User:Gerard Schildberger|Gerard Schildberger]] 19:59, 12 September 2012 (UTC)
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