73939133: I came across this fact. This is really cool. The specialty of this number is not just that it is a prime number but, every number that is produced by removing the last digit one by one is also a prime number. So, the following numbers are all prime.
7393913
739391
73939
7393
739
73
7
This is the largest such number known (as of today).
3 comments:
i don get it, wats the big shit? the principle works for any large no. with prime digits.
No man it does not...and any ways 9 is not a prime number..so you idea about the prime digits does not work. Also take for example 3333. It contains all prime digits but is itself divisible by 3, 11, 1111,303....
It is not a great stuff to proove that the highest number with that property is
1979339333
and there is also
373391399
higher than that number.
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