A366584 - OEIS

%I #11 Oct 23 2023 05:24:11

%S 1,1,2,2,7,13,3,11,3,149,137,7,103,31,7,103,103,79,97,5501,3469,919,

%T 51343,188869,853,1427,470077,239,313,307,73,883483,11113,227,53,3833,

%U 631,40093,4349,354763,142739687,45181,40320889337,71584631,3331,5500283

%N a(2) = a(3) = 1; for n >3, a(n) = largest prime factor of n-th Tribonacci number.

%H Amiram Eldar, <a href="/A366584/b366584.txt">Table of n, a(n) for n = 2..365</a>

%F a(n) = A006530(A000073(n)).

%e For n=24: A000073(24) = 2*2*2*51343, so a(24)=51343.

%t FactorInteger[#][[-1, 1]] & /@ LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 46] (* _Amiram Eldar_, Oct 23 2023 *)

%Y Cf. A000073, A231575, A101757.

%K nonn

%O 2,3

%A _Tyler Busby_, Oct 13 2023