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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.)