131

This number is a prime.

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

+ The only palindromic prime that is the sum of the reversals of two double-digit primes, i.e., 43 and 79. [Loungrides]

+ The smallest n-digit palindromic prime with central digit n, (n=3). [Loungrides]

+ The smallest 3-digit prime that remains prime when inserting one, two or three zeros between its digits, i.e., 10301, 1003001, 100030001 are primes. The other is 577. [Loungrides]

+ The smallest prime of form p*q-(r+s), where p, q, r, s are four consecutive primes, i.e., (13, 11, 7, 5). [Loungrides]

+ The fifth prime whose sum of digits is 5. [Loungrides]

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