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(just those submitted by Gupta)
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+ The sum of digits of the 31st Fibonacci number is 31. [Gupta]

+ 31 is the smallest multidigit prime in the decimal expansion of cube root of 31. [Gupta]

+ The reverse concatenation of first two triangular numbers is prime. [Gupta]

+ The smallest prime that can be represented as the sum of two triangular numbers in two different ways (21 + 10 and 28 + 3). [Gupta]

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