A072938 - OEIS

A072938

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

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

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OFFSET

1,2

COMMENTS

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

Numbers m such that d(m)>=d(k) for 0<k<2m {d(n) being the number of divisors function: A000005(n)}. - Lekraj Beedassy, Dec 16 2004

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

LINKS

EXAMPLE

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

CROSSREFS

KEYWORD

nonn,fini,full

AUTHOR

Anonymous, Aug 12 2002

EXTENSIONS

Edited by Klaus Brockhaus, Aug 13 2002

STATUS

approved