This number is a prime.

Just showing those entries submitted by 'Silva': (Click here to show all)

+ The smallest prime formed by concatenation of a prime and a semiprime. [Silva]

+ The only two-digit prime which is the sum of the digits of all previous two-digit primes. [Silva]

+ The only two-digit prime whose square is the sum of the squares of two consecutive two-digit numbers: (20^2+21^2). [Silva]

+ The smallest prime whose sum of the digits and difference of the digits are primes. [Silva]

+ The next prime after 29 is the (2+9)th prime. [Silva]

+ Prime formed with the only 1 even prime digit and the only 1 odd composite digit. Curiously, the sum of it´s digits is 11. [Silva]

+ The smallest prime which yields another when sandwiched between the sum of its digits: 1291. [Silva]

(There are 6 curios for this number that have not yet been approved by an editor.)

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