列出这样一些特殊的素数, $p=d_1d_2\ldots d_n$ 是素数, 它的反转(reverse) $q=\mathrm{reverse}(p)=d_n d_{n-1}\ldots d_2 d_1$ 也是素数.
列出这样一些特殊的素数, $p=d_1d_2\ldots d_n$ 是素数, 它的反转(reverse) $q=\mathrm{reverse}(p)=d_n d_{n-1}\ldots d_2 d_1$ 也是素数.
比如 91121 和 12119
使用 Calculator 进行验证.
>> isprime(91121)
in> isprime(91121)
This is function isprime
sqrtnum=301.862552
--------------------
we choose sqrtnum : 303
... since we use the traditional algorithm, ...
... please wait a minute ...
... ::: ... ::: ...
out> 91121 is a prime
------------------------
>> reverse(91121)
in> reverse(91121)
out> 12119
>> isprime(12119)
in> isprime(12119)
This is function isprime
sqrtnum=110.086330
--------------------
we choose sqrtnum : 111
... since we use the traditional algorithm, ...
... please wait a minute ...
... ::: ... ::: ...
out> 12119 is a prime