131
This number is a prime.
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The minimum prime p such that p ± 1 each has exactly 3 distinct prime factors. [Das]
The smallest prime that is not a quiteprime. [Beedassy]
The smallest palindromic prime using two distinct digits
which when interchanged forms another palindromic prime
(313). Note that in both cases a new palindromic prime with
a prime number of digits is generated when each digit
d is repeated d times: 13331; 3331333. [Beedassy]
The smallest Honaker
prime, i.e., 131 = P32, and 1 + 3 + 1 =
3 + 2. Note that the latter sum of digits corresponds to
the smallest prime with prime subscript (3 =
P2) added to its very (prime) subscript. [Beedassy]
The smallest prime equidistant between two consecutive emirps: 113, 149. [Beedassy]