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A145015 Run lengths in A037861 having the same sign. 0
1, 3, 1, 3, 3, 5, 3, 1, 1, 3, 1, 7, 7, 1, 3, 5, 3, 13, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 3, 1, 1, 3, 1, 7, 1, 15, 15, 1, 7, 1, 3, 5, 7, 1, 3, 5, 3, 13, 7, 1, 3, 5, 3, 13, 3, 29, 15, 1, 7, 1, 3, 1, 1, 3, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 3, 1, 1, 3, 1, 7, 1, 15, 7, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) seems (conjecture) to contain only the numbers 2^n - 1 (for n>=1) and 2^n - 3 (for n>=3)

LINKS

Table of n, a(n) for n=0..99.

EXAMPLE

A037861 is: 1,-1,0,-2,1,-1,-1,-3,2,0,0,-2,0,-2,-2,-4,3, ... so sign is +,-,0,-,+,-,-,-,+,0,0,-,0,-,-,-,+, ... thus sequence is 1,3,1,3,3,5, ...

CROSSREFS

Cf. A037861.

Sequence in context: A117572 A029153 A060241 * A085723 A186422 A165027

Adjacent sequences:  A145012 A145013 A145014 * A145016 A145017 A145018

KEYWORD

base,nonn

AUTHOR

Denis Boigelot (dboigelo(AT)ulb.ac.be), Sep 29 2008

STATUS

approved

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Last modified April 19 22:22 EDT 2019. Contains 322291 sequences. (Running on oeis4.)