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A022155 Values of n at which Golay-Rudin-Shapiro sequence A020985 is negative. 4
3, 6, 11, 12, 13, 15, 19, 22, 24, 25, 26, 30, 35, 38, 43, 44, 45, 47, 48, 49, 50, 52, 53, 55, 59, 60, 61, 63, 67, 70, 75, 76, 77, 79, 83, 86, 88, 89, 90, 94, 96, 97, 98, 100, 101, 103, 104, 105, 106, 110, 115, 118, 120, 121, 122, 126, 131, 134, 139, 140 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A020985(a(n)) = -1.

Or numbers n for which numbers of 1's and runs of 1's in binary representation have distinct parities: A010060(n) = 1 - A268411(n). - Vladimir Shevelev, Feb 10 2016

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

J. Brillhart and P. Morton, A case study in mathematical research: the Golay-Rudin-Shapiro sequence, Amer. Math. Monthly, 103 (1996) 854-869.

Vladimir Shevelev, Two analogs of Thue-Morse sequence, arXiv:1603.04434 [math.NT], 2016.

PROG

(Haskell)

import Data.List (elemIndices)

a022155 n = a022155_list !! (n-1)

a022155_list = elemIndices (- 1) a020985_list

-- Reinhard Zumkeller, Jan 02 2012

CROSSREFS

Cf. A203463 (complement), A020985.

Sequence in context: A028744 A028775 A223910 * A066157 A073159 A000419

Adjacent sequences:  A022152 A022153 A022154 * A022156 A022157 A022158

KEYWORD

nonn

AUTHOR

Robert G. Wilson v

STATUS

approved

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Last modified November 23 00:33 EST 2017. Contains 295107 sequences.