The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A075424 a(n) = A075423(A075423(n)). 3
 0, 1, 0, 1, 4, 5, 0, 1, 2, 9, 4, 5, 12, 13, 0, 1, 4, 5, 2, 9, 20, 21, 4, 1, 4, 1, 12, 13, 28, 29, 0, 1, 32, 33, 4, 5, 36, 37, 2, 9, 40, 41, 20, 13, 14, 45, 4, 5, 2, 9, 4, 25, 4, 5, 12, 13, 56, 57, 28, 29, 60, 9, 0, 1, 64, 65, 32, 33, 68, 69, 4, 5, 72, 13, 36, 37, 76, 77, 2, 1, 2, 81, 40, 41 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,5 COMMENTS From Robert Israel, Apr 11 2019: (Start) a(n) == n (mod 2). a(n) = 0 iff n is in A000079. a(n) = n-2 iff n-1 is in A007674. (End) LINKS Robert Israel, Table of n, a(n) for n = 2..10000 MAPLE A075423:= n -> convert(numtheory:-factorset(n), `*`)-1: map(A075423@@2, [\$2..100]); # Robert Israel, Apr 11 2019 CROSSREFS Cf. A000079, A007674, A075423, A075425. Sequence in context: A254294 A143574 A262400 * A200619 A199621 A199390 Adjacent sequences: A075421 A075422 A075423 * A075425 A075426 A075427 KEYWORD nonn,look AUTHOR Reinhard Zumkeller, Sep 15 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 19 00:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)