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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
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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 March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)