The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A072690 a(n) = (n - A048760(n)) * (A048761(n) - n). 1
 0, 2, 2, 0, 4, 6, 6, 4, 0, 6, 10, 12, 12, 10, 6, 0, 8, 14, 18, 20, 20, 18, 14, 8, 0, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 0, 12, 22, 30, 36, 40, 42, 42, 40, 36, 30, 22, 12, 0, 14, 26, 36, 44, 50, 54, 56, 56, 54, 50, 44, 36, 26, 14, 0, 16, 30, 42, 52, 60, 66, 70, 72, 72, 70, 66 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n)=0 iff n is a square. LINKS FORMULA a(n) = A053186(n) * (A072689(n) - A053186(n)). CROSSREFS a(n) = A053186(n) * A068527(n). Sequence in context: A168587 A320119 A100240 * A199454 A244130 A180813 Adjacent sequences:  A072687 A072688 A072689 * A072691 A072692 A072693 KEYWORD nonn AUTHOR Reinhard Zumkeller, Jul 02 2002 STATUS approved

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

Last modified May 28 07:30 EDT 2022. Contains 354112 sequences. (Running on oeis4.)