A084189 - OEIS

%I #5 Dec 15 2017 17:36:21

%S 2,2,3,1,1,1,1,1,0,1,0,1,0,1,0,1,0,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,

%T 0,0,1,0,0,0,1,0,0,0,0,2,2,0,0,0,2,0,0,0,1,1,1,1,1,1,1,0,1,1,0,0,0,0,

%U 0,0,1,1,1,1,1,0,1,1,1,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1

%N Minimum digit out of both prime factors of the numbers in A046376.

%C Conjecture: a(n) is never greater than 3.

%C Suggested by this old JRM problem: "Find a composite palindrome larger than 343 whose prime factors are palindromes consisting of digits greater than 3."

%e a(9)=1 because the factors of A046376(9)= 262 are 2*131 and the minimum digit is 1.

%K base,nonn

%O 0,1

%A _Jason Earls_, Jun 20 2003