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 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

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