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Search: id:A072938
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| A072938 |
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Highly composite numbers which are half of the next highly composite number. |
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+0
12
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OFFSET
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1,2
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COMMENT
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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 (blekraj(AT)yahoo.com), Dec 16 2004
W. Brefeld (cf. link) gives a proof that there are no other terms. - Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 05 2006
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LINKS
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Werner Brefeld, Ramanujan, zusammengesetzte Zahlen und ihre Teilbarkeit
Achim Flammenkamp Highly Composite Numbers
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EXAMPLE
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6 = A002182(4) is a term since A002182(5) = 12 = 2*6.
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CROSSREFS
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Cf. A002182, A002201, A106037, A094348, A003418, A002110.
Sequence in context: A104350 A072489 A072487 this_sequence A160274 A048803 A068625
Adjacent sequences: A072935 A072936 A072937 this_sequence A072939 A072940 A072941
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KEYWORD
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nonn,fini,full
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AUTHOR
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Anon, Aug 12, 2002
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EXTENSIONS
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Edited by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 13 2002
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