A281093 - OEIS

%I #20 Jan 24 2017 20:44:58

%S 3,7,37,43,47,73,79,97,337,347,349,373,379,397,433,439,443,449,479,

%T 499,733,739,743,773,797,937,947,977,997,3343,3347,3373,3433,3449,

%U 3499,3733,3739,3779,3793,3797,3943,3947,4337,4339,4349,4373,4397,4447,4493,4733

%N Primes that only use digits that survived in the movie 9: {3, 4, 7, 9}.

%C The Fibonacci prime 433494437 is in this sequence.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/9_(2009_animated_film)">9 (2009 animated film)</a>

%F a(n) >> n^k, where k = log(10)/log(4) = 1.660964.... - _Charles R Greathouse IV_, Jan 24 2017

%o (PARI) is(n)=#setunion(Set(digits(n)), [3,4,7,9])==4 && isprime(n) \\ _Charles R Greathouse IV_, Jan 24 2017

%Y Cf. A091633.

%K base,nonn

%O 1,1

%A _Bobby Jacobs_, Jan 24 2017