login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A334196 a(1) = 0, then after the first differences of A003434. 2
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 10:30 EDT 2021. Contains 345056 sequences. (Running on oeis4.)