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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 multi-digit number such that both 36*63+1 and 36*63-1 are prime. [Gupta]

+ The smallest triangular number whose sum of divisors as well as sum of aliquot divisors is also a triangular number. [Gupta]

+ The smallest power (greater than 1) which is not a prime power. [Gupta]




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