A084300 - OEIS

A084300

a(n) = phi(n) mod 6.

1, 1, 2, 2, 4, 2, 0, 4, 0, 4, 4, 4, 0, 0, 2, 2, 4, 0, 0, 2, 0, 4, 4, 2, 2, 0, 0, 0, 4, 2, 0, 4, 2, 4, 0, 0, 0, 0, 0, 4, 4, 0, 0, 2, 0, 4, 4, 4, 0, 2, 2, 0, 4, 0, 4, 0, 0, 4, 4, 4, 0, 0, 0, 2, 0, 2, 0, 2, 2, 0, 4, 0, 0, 0, 4, 0, 0, 0, 0, 2, 0, 4, 4, 0, 4, 0, 2, 4, 4, 0, 0, 2, 0, 4, 0, 2, 0, 0, 0, 4, 4, 2, 0, 0, 0

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OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000010(n) mod 6.

a(n) = A010875(A000010(n)). - Amiram Eldar, Aug 17 2024

MATHEMATICA

a[n_] := Mod[EulerPhi[n], 6]; Array[a, 100] (* Amiram Eldar, Aug 17 2024 *)

PROG

(PARI) A084300(n) = (eulerphi(n)%6); \\ Antti Karttunen, Aug 22 2017