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!)
A039639 Fixed point of "k -> k/2 or (k-1)/2 until result is prime", starting with prime(n)+1. 4

%I #9 Nov 17 2013 14:52:37

%S 3,2,3,2,3,7,2,5,3,7,2,19,5,11,3,13,7,31,17,2,37,5,5,11,3,3,13,13,13,

%T 7,2,2,17,17,37,19,79,41,5,43,11,11,3,97,3,3,53,7,7,7,29,7,7,31,2,2,

%U 67,17,139,17,71,73,19,19,157,79,83,5,43,43,11,11,23,23,47,3,97,199,3

%N Fixed point of "k -> k/2 or (k-1)/2 until result is prime", starting with prime(n)+1.

%H Reinhard Zumkeller, <a href="/A039639/b039639.txt">Table of n, a(n) for n = 1..10000</a>

%t see A039634.

%o (Haskell)

%o a039639 = until ((== 1) . a010051) (flip div 2) . (+ 1) . a000040

%o -- _Reinhard Zumkeller_, Nov 17 2013

%Y Cf. A039634-A039645.

%Y Cf. A010051, A000040, A039643, A039641, A039634.

%K nonn

%O 1,1

%A _Wouter Meeussen_

%E Offset corrected by _Reinhard Zumkeller_, Nov 17 2013

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 August 25 11:53 EDT 2024. Contains 375438 sequences. (Running on oeis4.)