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A264739 Characteristic function of numbers in the range of Euler's totient function, cf. A000010. 5
1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

COMMENTS

a(A002202(n)) = 1 and a(A007617(n)) = 0.

LINKS

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

PROG

(Haskell)

import Data.List.Ordered (has)

a264739 n = if a002202_list `has` n then 1 else 0

CROSSREFS

Cf. A000010, A002202, A007617, A264810 (partial sums), A180639.

Sequence in context: A326956 A322860 A178225 * A257170 A073097 A117569

Adjacent sequences:  A264736 A264737 A264738 * A264740 A264741 A264742

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Nov 26 2015

STATUS

approved

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Last modified July 9 16:50 EDT 2020. Contains 335545 sequences. (Running on oeis4.)