login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A251768 Run lengths in A251539. 3
7, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 4, 1, 8, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 2, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 2, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 3, 1, 8, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 2, 10, 1, 10, 1, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

max = 2000 (* = max term of A251538 *);

A098548 = {1, 2, 3};

For[n = 4, n <= 8 max, n++, If[GCD[n, A098548[[-1]]] == 1 && GCD[n, A098548[[-2]]] > 1, AppendTo[A098548, n]]];

A251538 = Select[Range[max], A098548[[2 # + 3]] > A098548[[2 # + 1]] + 6&];

A251539 = Differences[A251538];

Length /@ Split[A251539] (* Jean-Fran├žois Alcover, Aug 01 2018 *)

PROG

(Haskell)

import Data.List (group)

a251768 n = a251768_list !! (n-1)

a251768_list = map length $ group a251539_list

CROSSREFS

Cf. A249943, A251767.

Sequence in context: A197019 A048835 A124970 * A178034 A124886 A061195

Adjacent sequences:  A251765 A251766 A251767 * A251769 A251770 A251771

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 08 2014

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 9 20:11 EDT 2020. Contains 333362 sequences. (Running on oeis4.)