Prime Curios!: 1111

1111
(another Prime Pages' Curiosity)

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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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