A334196 a(1) = 0, then after the first differences of A003434.

0, 1, 1, 0, 1, -1, 1, 0, 0, 0, 1, -1, 1, -1, 1, 0, 1, -2, 1, 0, 0, 0, 1, -1, 1, -1, 0, 0, 1, -1, 1, 0, 0, 0, 0, -1, 1, -1, 1, 0, 1, -2, 1, 0, 0, 0, 1, -1, 0, 0, 1, -1, 1, -2, 2, -1, 0, 0, 1, -1, 1, -1, 0, 1, 0, -1, 1, 0, 0, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 0, -1, 1, 1, -2, 2, -2, 1, 0, 1, -2, 1, 0, 0, 0, 0, 0, 1, -2, 1, 0, 1, -1, 1, -1, 0

Offset

1,18

Comments

Also, from a(2) onward the first differences of A049108, and from a(3) onward the first differences of A032358.

Links

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

Formula

a(1) = 0; and for n > 1, a(n) = A003434(n) - A003434(n-1).

Prog

(PARI)
A003434(n) = for(k=0, n, n>1 || return(k); n=eulerphi(n));
A334196(n) = if(1==n, 0, A003434(n)-A003434(n-1));

Crossrefs

Cf. A000010, A003434, A032358, A049108, A334195.

Sequence in context: A279024 A213731 A299197 * A143111 A328361 A301367

Adjacent sequences: A334193 A334194 A334195 * A334197 A334198 A334199

Keyword

sign

Author

Antti Karttunen, Apr 18 2020

Status

approved