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A334195 a(1) = 0, then after the first differences of A064415. 5
0, 1, 0, 1, 0, 0, 0, 1, -1, 1, 0, 0, 0, 0, 0, 1, 0, -1, 0, 1, -1, 1, 0, 0, 0, 0, -1, 1, 0, 0, 0, 1, -1, 1, -1, 0, 0, 0, 0, 1, 0, -1, 0, 1, -1, 1, 0, 0, -1, 1, 0, 0, 0, -1, 1, 0, -1, 1, 0, 0, 0, 0, -1, 2, -1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, 2, 0, -1, 1, -1, 0, 1, 0, -1, 0, 1, -1, 1, -1, 1, 0, -1, 0, 1, 0, 0, 0, 0, -1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,64

LINKS

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

FORMULA

a(1) = 0; and for n > 1, a(n) = A064415(n) - A064415(n-1).

a(n) = A334090(n) - A334091(n).

PROG

(PARI)

A003434(n) = for(k=0, n, n>1 || return(k); n=eulerphi(n));

A064415(n) = if(1==n, 0, A003434(n)-(n%2));

A334195(n) = if(1==n, 0, A064415(n)-A064415(n-1));

CROSSREFS

Cf. A003434, A064415, A334090, A334091, A334196.

Also, from a(3) onward the first differences of A054725.

Sequence in context: A155102 A237621 A214625 * A279278 A015964 A088950

Adjacent sequences:  A334192 A334193 A334194 * A334196 A334197 A334198

KEYWORD

sign

AUTHOR

Antti Karttunen, Apr 18 2020

STATUS

approved

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Last modified June 21 12:53 EDT 2021. Contains 345364 sequences. (Running on oeis4.)