A361120 - OEIS

%I #9 Mar 03 2023 14:02:38

%S 1,3,5,7,7,3,5,11,11,3,7,11,11,5,5,11,13,13,3,7,13,13,5,17,17,7,3,13,

%T 17,17,7,19,19,5,3,11,17,17,5,23,23,19,19,13,13,5,7,29,29,31,31,7,7,

%U 37,37,17,17,41,41,5,23,23,7,5,29,29,7,3,43,43,5,11,47

%N a(n) is the greatest prime factor of A360519(n) with a(1) = 1.

%C See A361119 for the least prime factors.

%H Rémy Sigrist, <a href="/A361120/b361120.txt">Table of n, a(n) for n = 1..10000</a>

%H Rémy Sigrist, <a href="/A361120/a361120.gp.txt">PARI program</a>

%F a(n) = A006530(A360519(n)).

%e A360519(2) = 2*3 so a(2) = 3.

%o (PARI) See Links section.

%Y Cf. A006530, A360519, A361119.

%K nonn,look

%O 1,2

%A _Scott R. Shannon_, _Rémy Sigrist_ and _N. J. A. Sloane_, Mar 03 2023