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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 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.)