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Numbers n such that n, 2n, 3n are all highly composite numbers.
1

%I #9 Aug 27 2019 09:52:17

%S 2,12,60,120,840,2520,5040,27720,55440,110880,166320,720720,1441440,

%T 2162160,3603600,7207200,10810800,36756720,61261200,122522400,

%U 183783600,367567200,698377680,2327925600,3491888400,6983776800,13967553600,48886437600,80313433200,160626866400

%N Numbers n such that n, 2n, 3n are all highly composite numbers.

%H Amiram Eldar, <a href="/A143770/b143770.txt">Table of n, a(n) for n = 1..7717</a>

%e 120 qualifies because all of 120, 240 and 360 are highly composite.

%Y Cf. A002182.

%K nonn

%O 1,1

%A _J. Lowell_, Aug 31 2008

%E Extended by _R. J. Mathar_, Sep 12 2008

%E More terms from _Amiram Eldar_, Aug 27 2019