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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

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Last modified April 24 00:02 EDT 2019. Contains 322404 sequences. (Running on oeis4.)