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A174837 Sequence built as it follows in comments. 1
9, 2, 45, 2, 11, 2, 225, 2, 11, 2, 56, 2, 11, 2, 1125, 2, 11, 2, 56, 2, 11, 281, 2, 11, 2, 56, 2, 11, 2, 5625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

If we denote "A" the finite sequence between a(2^(n-1)-2) and a(2^n-2), the subsequence of a between

a(2^(n)-2) and a(2^(n+1)-2) is given by: " A - a(3*2^(n-1)-2) - A" for every n>=2.

LINKS

Table of n, a(n) for n=0..29.

FORMULA

a(2n+1)=2. a(2^(n+1)-2)=9*5^n. a(3*2^n-2)=(9*5^n-1)/4.

EXAMPLE

a(4)=a(2*3-2)=(9*4-1)/4=11. a(14)=a(2^4-2)==9*5^3=125*9=1125.

Between a(2) and a(6) the subsequence is "2, 11, 2"; then between a(6) and a(14) the subsequence of a is:

"2, 11, 2, a(10)=56, 2, 11, 2".

It seems that this new sequence gives the number of 2 in the sets of 2 of the sequence A174835.

CROSSREFS

Cf. A174835.

Sequence in context: A152020 A055516 A248314 * A096042 A038292 A294685

Adjacent sequences:  A174834 A174835 A174836 * A174838 A174839 A174840

KEYWORD

easy,nonn,uned

AUTHOR

Richard Choulet, Mar 30 2010

STATUS

approved

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Last modified August 2 02:53 EDT 2021. Contains 346409 sequences. (Running on oeis4.)