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A325321 a(n) = 1 if cototient of n is a square, 0 otherwise. 1
1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

COMMENTS

Characteristic function of A063752.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for characteristic functions

FORMULA

a(n) = A010052(A051953(n)).

MATHEMATICA

Array[Boole[IntegerQ@ Sqrt[# - EulerPhi@ #]] &, 105] (* Michael De Vlieger, Apr 21 2019 *)

PROG

(PARI) A325321(n) = issquare(n-eulerphi(n));

CROSSREFS

Cf. A000010, A010052, A051953, A063752.

Sequence in context: A230901 A285671 A267773 * A255887 A295316 A014677

Adjacent sequences:  A325318 A325319 A325320 * A325322 A325323 A325324

KEYWORD

nonn

AUTHOR

Antti Karttunen, Apr 21 2019

STATUS

approved

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Last modified August 3 20:08 EDT 2020. Contains 336201 sequences. (Running on oeis4.)