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%I #34 Mar 04 2018 17:47:06
%S 1,2,6,360360,360360,6,420,360360,18,10,66,360360,5460,14,360360,
%T 2329089562800,306,18,190,360360,42,22,8288280,360360,1801800,26,54,
%U 420,10450440,360360,52573842877942565273243107104095419458814459401768000
%N a(n) is the last defined element in the sequence n, f(n), f(f(n)), ..., where f(t) = lcm(t,(b+c)/2) with b < c smallest consecutive divisors of t with c - b > 1 and f(t) is undefined if such b, c do not exist or b + c is odd.
%C a(256) = 996169...200000 has 3547 decimal digits. - _Alois P. Heinz_, Mar 12 2012
%H Alois P. Heinz, <a href="/A206034/b206034.txt">Table of n, a(n) for n = 1..255</a>
%e a(4) = 360360 because the sequence is 4, 12, 60, 120, 840, 2520, 27720, 360360, but 360360 has b=15 and c=18 and f(360360) is not defined.
%K nonn
%O 1,2
%A _J. Lowell_, Mar 12 2012
%E More terms from _Alois P. Heinz_, Mar 12 2012
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