Print[DateString[]];
c=0; While[c++; PrimeQ[IntegerReverse[r=RandomPrime[{10^1999,2*10^1999}]]]==False];
Print[{DateString[], c}]; r
Mon 23 Mar 2026 16:19:04
{Mon 23 Mar 2026 18:37:09, 305}
IntegerReverse[r]
Click on either number to check its primality.
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