11110...01111 (25-digits)

This number is a prime.

                                                 11110 1110110101 1011101111

Just showing those entries submitted by 'Wesolowski': (Click here to show all)

+ The smallest palindromic prime with middle digit 1 that is formed from the reflected successive concatenation of a decreasing number of repeated 1's and 0's. [Wesolowski]

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