1111111111111111111
This number is a prime.
111111111 1111111111
Just showing those entries submitted by 'Green': (Click here to show all)
The largest prime factor of the alternate-digit, palindromic semiprime 1010101010101010101010101010101010101 is the repunit prime 1111111111111111111. Both numbers contain 19 1's. [Green]
The second (and largest known) repunit prime to be prime in both decimal and binary. [Green]
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Each of the 10 palindromes in the trapezoidal structure to the right contains 19 ones, and the repunit prime, R19, is the largest prime factor of each one. |
1111111111111111111 101111111111111111101 10101111111111111110101 1010101111111111111010101 101010101111111111101010101 10101010101111111110101010101 101010101010111111101010101010 101010101010101111101010101010101 10101010101010101110101010101010101 1010101010101010101010101010101010101 |
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