login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A185038 Positions at which A090895 (a(1) = 1 then a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1) + n otherwise) reach the value of 1. 2
1, 8, 15, 64, 7069, 229826, 62906548, 104509874538, 209233407362, 474536678820, 2653613575299, 14802269029898 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It seems that this sequence is infinite.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Example: the sequence a(1)=1 then a(n)=a(n-1)/2 if a(n-1) is even, a(n) = a(n-1) + n otherwise goes 1, 3, 6, 3, 8, 4, 2, 1, 10, 5, 16, 8, 4, 2, 1, etc... which has ones at 1, 8, 15, 64, etc...

PROG

(Haskell)

import Data.List (elemIndices)

a185038 n = a185038_list !! (n-1)

a185038_list = map (+ 1) $ elemIndices 1 a090895_list

-- Reinhard Zumkeller, Mar 02 2012

CROSSREFS

Cf. A090895.

Sequence in context: A166704 A161342 A048732 * A193490 A015442 A253211

Adjacent sequences:  A185035 A185036 A185037 * A185039 A185040 A185041

KEYWORD

more,hard,nonn

AUTHOR

Sergio Pimentel, Mar 01 2012

EXTENSIONS

a(8)-a(12) from Hiroaki Yamanouchi, Oct 04 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 December 12 01:57 EST 2019. Contains 329948 sequences. (Running on oeis4.)