A072938 Highly composite numbers that are half of the next highly composite number.

1, 2, 6, 12, 60, 360, 2520

Offset: 1

Author

Anonymous, Aug 12 2002

Keywords

• nonn
• fini
• full

Comments

A002182(k) such that A002182(k+1) = 2*A002182(k).

Numbers m such that d(m)>=d(k) for 0A000005(n)}. - Lekraj Beedassy, Dec 16 2004

W. Brefeld (cf. link) gives a proof that there are no other terms. - Klaus Brockhaus, Mar 05 2006

Examples

			6 = A002182(4) is a term since A002182(5) = 12 = 2*6.
		

Links

• Werner Brefeld, Ramanujan, zusammengesetzte Zahlen und ihre Teilbarkeit.
• Achim Flammenkamp, Highly Composite Numbers.

Crossrefs

Cf. A002110, A002182, A002201, A003418, A094348, A106037, A165412.

Extensions

Edited by Klaus Brockhaus, Aug 13 2002