RE Curious Prime Curio (391 and 319)
----- Original Message -----
From: "Anton" <al_at_i@...>
><http://primes.utm.edu/curios/index.php?start=4&stop=4> we can read:
>quote "We have presented prime curios for hundreds of integers, but
>still have missed so many! The first positive integer which is missing
>a prime curio is 391 ...." un-quote
391 is the first Smith number ( http://www.research.att.com/~njas/sequences/A006753 ) that
is also of the form F(n)+n , with F(n) the Fibonacci numbers (
http://www.research.att.com/~njas/sequences/A002062 ). Also the first Smith number that is
of the form prime(n)·prime(n+2) ( http://www.research.att.com/~njas/sequences/A090076 ).
BTW, looking at the OEIS I found that 319 seems to be the first number that is a
Brilliant, Joke (Smith), Happy and Lucky one! (We could call them Truly Lucky numbers!