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A295303 a(n) = +1 if n > phi(sigma(n)), -1 if n < phi(sigma(n)), and 0 if n = phi(sigma(n)), where phi = A000010 and sigma = A000203. 5
0, 0, 1, -1, 1, 1, 1, 0, -1, 1, 1, 0, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1

LINKS

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

FORMULA

a(n) = sign(A295301(n)) = sign(n - phi(sigma(n))).

PROG

(PARI) A295303(n) = sign(n - eulerphi(sigma(n)));

CROSSREFS

Cf. A000010, A000203, A062401, A295301, A295304.

Cf. A001229 (positions of 0's), A066694 (of -1's).

Sequence in context: A086823 A228487 A295306 * A288226 A104121 A179770

Adjacent sequences:  A295300 A295301 A295302 * A295304 A295305 A295306

KEYWORD

sign

AUTHOR

Antti Karttunen, Nov 21 2017

STATUS

approved

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Last modified February 20 22:51 EST 2019. Contains 320362 sequences. (Running on oeis4.)