A132138 - OEIS

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A132138

Characteristic function of the set of numbers defined in A002977.

1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

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OFFSET

1,1

COMMENTS

a(A002977(n)) = 1 and a(A132142(n)) = 0.

LINKS

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

Index entries for characteristic functions

FORMULA

a(n) = if chi(n) then 1 else 0, where chi(n) = if n<3 then (n=1) else ((n mod 2 = 1) AND chi((n-1)/2)) OR ((n mod 3 = 1) AND chi((n-1)/3)).

CROSSREFS

Sequence in context: A118174 A353815 A156258 * A141212 A341347 A137893

Adjacent sequences: A132135 A132136 A132137 * A132139 A132140 A132141

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 20 2007

STATUS

approved