The book is now available! 1111
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+ The concatenation of the prime number 11 with itself.

+ 1111 equals 112 + 122 + 132 + 142 + 152 + 162. [De Geest]

+ 1111 = 11 * 101 in both base 10 and base 2. Notice the factors (11 and 101) are palindromic primes in both of these bases. [Shafer]

+ The sum of the digits of the first 100 primes. [Wilson]

+ The smallest tetradic semiprime with tetradic factors. [Capelle]

(There are 4 curios for this number that have not yet been approved by an editor.)

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