The book is now available! 1111111111111111111
(just those submitted by Green)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                                                        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]

+

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

[Green]




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