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(just those submitted by Gupta)
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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]

(There is one curio for this number that has not yet been approved by an editor.)




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