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%I A215964 #15 Feb 21 2020 20:09:58
%S A215964 2,103,163,199,397,421,757,883,991,1021,1087,1123,1237,1543,1567,1609,
%T A215964 1753,1873,2539,2731,2797,2803,2953,3259,3391,3433,3499,3613,3631,
%U A215964 3733,3853,3877,3943,4093,4591,4621,4723,4789,4933,4951,4987,4999
%N A215964 Prime tribonacci non-divisors.
%C A215964 Prime numbers that do not divide any term of A000213.
%H A215964 V. Raman and Charles R Greathouse IV, <a href="/A215964/b215964.txt">Table of n, a(n) for n = 1..1000</a> (first 107 terms from Raman)
%H A215964 Project Euler, <a href="https://projecteuler.net/problem=225">Problem #225: Tribonacci non-divisors</a>
%o A215964 (PARI) is(n)=my(a=1,b=1,c=1,t);for(i=1,n^2,t=(a+b+c)%n;if(t,a=b;b=c;c=t,return(0));if(c==1&&b==1&&a==1,return(isprime(n)))) \\ _Charles R Greathouse IV_, Aug 29 2012
%Y A215964 Cf. A000213, A046735, A215782.
%K A215964 nonn
%O A215964 1,1
%A A215964 _V. Raman_, Aug 29 2012

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