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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A308469 a(1) = 1, a(2)=2, a(n) = a(n-1) + gcd(a(n-2), n-2). 0
1, 2, 3, 5, 8, 9, 10, 13, 14, 15, 16, 21, 22, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 45, 46, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 93, 94, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Apparently, the distinct values of a(n)-n for n > 7 correspond to A190894. - Rémy Sigrist, Jul 23 2019
LINKS
MATHEMATICA
a[1] = 1; a[2] = 2; a[n_] := a[n] = a[n-1] + GCD[a[n-2], n-2]; Array[a, 70] (* Amiram Eldar, Aug 01 2019 *)
CROSSREFS
Sequence in context: A047607 A113051 A047372 * A247547 A096974 A286486
KEYWORD
nonn
AUTHOR
Thomas Kerscher, May 29 2019
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 15:05 EDT 2024. Contains 372826 sequences. (Running on oeis4.)