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The smallest prime with persistence (multiplicative as well as additive) of 1. [Gupta]
The smallest odd prime which can be represented as sum of a triangular number and its reverse, i.e., 10 + 01 = 11. [Gupta]
The largest known example such that p# ± 1 are both primes. p# is primorial p. [Gupta]
The smallest odd prime which can be represented as the sum of a number and its reverse, i.e., 10 + 01 = 11. [Gupta]
11 is the smallest prime p such that sigma(x) = 2^p has no solution. [Gupta]
The largest number (coincidentally prime) which is not expressible as sum of two composite numbers. [Gupta]
The hour and minute hands of an analog clock align exactly
11 times every twelve hours. [Gupta]
The smallest prime whose factorial ends in prime number of
Great Britain lost 11 days in 1752 because of the Julian to Gregorian Calendar change. [Gupta]
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