This site is supported by donations to The OEIS Foundation.

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A046952 Sets record for f(n) = |{(a,b):a*b=n and a|b}|. Also squares of highly composite numbers A002182. 3
 1, 4, 16, 36, 144, 576, 1296, 2304, 3600, 14400, 32400, 57600, 129600, 518400, 705600, 1587600, 2822400, 6350400, 25401600, 57153600, 101606400, 228614400, 406425600, 635040000, 768398400, 2057529600, 2540160000, 3073593600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Invented by the HR automatic theory formation program. LINKS S. Colton, Refactorable Numbers - A Machine Invention, J. Integer Sequences, Vol. 2, 1999, #2. EXAMPLE f(1)=1, (first with 1), f(4)=2 (first with 2), f(16)=3 (first with 3), CROSSREFS Cf. A002182, A046951. Sequence in context: A181795 A136404 A176471 * A081456 A223403 A263385 Adjacent sequences:  A046949 A046950 A046951 * A046953 A046954 A046955 KEYWORD nice,nonn AUTHOR Simon Colton (simonco(AT)cs.york.ac.uk) STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .