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The concatenation of the prime number 11 with itself. 1111 equals 11^{2} + 12^{2} + 13^{2} + 14^{2} + 15^{2} + 16^{2}. [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]
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