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A261872 a(n) = phi(n) mod 5, where phi is the Euler totient function. 1
1, 1, 2, 2, 4, 2, 1, 4, 1, 4, 0, 4, 2, 1, 3, 3, 1, 1, 3, 3, 2, 0, 2, 3, 0, 2, 3, 2, 3, 3, 0, 1, 0, 1, 4, 2, 1, 3, 4, 1, 0, 2, 2, 0, 4, 2, 1, 1, 2, 0, 2, 4, 2, 3, 0, 4, 1, 3, 3, 1, 0, 0, 1, 2, 3, 0, 1, 2, 4, 4, 0, 4, 2, 1, 0, 1, 0, 4, 3, 2, 4, 0, 2, 4, 4, 2, 1, 0, 3, 4, 2, 4, 0, 1, 2, 2, 1, 2, 0, 0, 0, 2, 2, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

FORMULA

a(n) = A000010(n) mod 5 = A010874(A000010(n)).

MATHEMATICA

Table[Mod[EulerPhi[n], 5], {n, 110}]

PROG

(MAGMA) [EulerPhi(n) mod 5: n in [1..110]];

(PARI) a(n) = eulerphi(n) % 5; \\ Michel Marcus, Sep 05 2015

CROSSREFS

Cf. A000010, A010874, A074942, A084300.

Sequence in context: A080917 A033726 A126768 * A021450 A239675 A289827

Adjacent sequences:  A261869 A261870 A261871 * A261873 A261874 A261875

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Sep 04 2015

EXTENSIONS

More terms from Antti Karttunen, Dec 04 2017

STATUS

approved

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Last modified August 12 17:17 EDT 2020. Contains 336439 sequences. (Running on oeis4.)