A143770 Numbers n such that n, 2n, 3n are all highly composite numbers.

2, 12, 60, 120, 840, 2520, 5040, 27720, 55440, 110880, 166320, 720720, 1441440, 2162160, 3603600, 7207200, 10810800, 36756720, 61261200, 122522400, 183783600, 367567200, 698377680, 2327925600, 3491888400, 6983776800, 13967553600, 48886437600, 80313433200, 160626866400

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..7717

Example

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

Crossrefs

Cf. A002182.

Sequence in context: A001758 A037133 A009618 * A062478 A005430 A094434

Adjacent sequences: A143767 A143768 A143769 * A143771 A143772 A143773

Keyword

nonn

Author

J. Lowell, Aug 31 2008

Extensions

Extended by R. J. Mathar, Sep 12 2008

More terms from Amiram Eldar, Aug 27 2019

Status

approved