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!)
A130336 Record values in A130335. 2
1, 2, 7, 10, 13, 22, 31, 37, 58, 79, 82, 94, 109, 118, 157, 178, 193, 214 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A130335(A130337(n)).
A130335(k) < a(n) for k < A130337(n).
MATHEMATICA
f[n_] := Block[{k = 1}, While[ GCD[n(n + 1)/2, (n + k)(n + k + 1)/2] != 1, k++ ]; k]; t = Table[0, {1000}]; Do[a = f@n; If[a < 1001 && t[[a]] == 0, t[[a]] = n; Print[{a, n}], If[a > 1000, Print[{"Over 1000", n}]]], {n, 2^31 - 1}] (* Robert G. Wilson v, Jun 03 2007 *)
CROSSREFS
Sequence in context: A203621 A297832 A003158 * A303741 A085303 A304799
KEYWORD
nonn,more
AUTHOR
Reinhard Zumkeller, May 28 2007
EXTENSIONS
a(13)-a(16) from Robert G. Wilson v, Jun 03 2007
Added a(17) and corrected a(12) by Chai Wah Wu, Sep 16 2021
a(18) from Chai Wah Wu, Sep 23 2021
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 23 16:36 EDT 2024. Contains 372765 sequences. (Running on oeis4.)