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+ 19 is the smallest prime p such that 10*p {+ 1, 3, 7, and 9} are all primes. [Das]

+ The first prime repfigit number. A repfigit (repetitive fibonacci-like digit) number is an n-digit integer N with the following property: if a Fibonacci-like sequence (in which each term in the sequence is the sum of the n previous terms) is formed, with the first n terms being the decimal digits of the number N, then N itself occurs as a term in the sequence. For example, if the digits of 19 start a Fibonacci-like sequence, then 19 appears as a term: 1, 9, 10, 19. These are also known as Keith numbers. [Beedassy]

+ The largest prime that is palindromic in Roman numerals alphabetically is XIX (19). [Beedassy]

+ 19 is the "age of majority" adopted under federal jurisdiction in two US states, viz., Nebraska, Alabama. [Beedassy]

+ The index p of the largest known Mersenne prime Mp = 2p - 1 having an associated perfect number Mp*2p - 1 that is short of a prime by 1. [Beedassy]

+ The number of topologically distinct planar configurations without discontinuities that are possible using six matches. [Beedassy]

+ The number of letters in the anagrammatic title "A Superb Mosaic - Dare it !" that fittingly qualifies the "PRIME CURIOS DATABASE" with a poetic touch. [Beedassy]

+ Pandigital palindromic primes start as 19-digit numbers. [Beedassy]

(There is one curio for this number that has not yet been approved by an editor.)

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