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Just showing those entries submitted by 'Gupta': (Click here to show all) 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 smallest prime whose factorial ends in prime number of zeros. [Gupta]
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