18661...19981 (1576-digits)
This number is a prime.
Just showing those entries submitted by 'Garg': (Click here to show all)
The largest known strobogrammatic emirp (as of 28 October 2026). This 1576-digit prime reads the same rotated 180 degrees, and its reversal (the same digits with every 6 and 9 swapped) is also prime. Both were proven prime with ECPP (CM 0.4.4). [Garg]
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