181

This number is a prime.

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

The smallest palindromic prime resulting from the sum of three consecutive emirps (37, 71, 73). [Silva]

181 equals the sum of the squares of three consecutive composite digits: 6^2+8^2+9^2. [Silva]

The smallest palindromic prime expressed as 2n^2+2n+1. [Silva]