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 A318304 a(n) = A083254(n)/A003557(n) = (2*A173557(n) - A007947(n)). 3
 1, 0, 1, 0, 3, -2, 5, 0, 1, -2, 9, -2, 11, -2, 1, 0, 15, -2, 17, -2, 3, -2, 21, -2, 3, -2, 1, -2, 27, -14, 29, 0, 7, -2, 13, -2, 35, -2, 9, -2, 39, -18, 41, -2, 1, -2, 45, -2, 5, -2, 13, -2, 51, -2, 25, -2, 15, -2, 57, -14, 59, -2, 3, 0, 31, -26, 65, -2, 19, -22, 69, -2, 71, -2, 1, -2, 43, -30, 77, -2, 1, -2, 81, -18, 43, -2, 25 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = A083254(n)/A003557(n) = 2*A173557(n) - A007947(n). a(n) = A173557(n) - A318305(n). PROG (PARI) A173557(n) = my(f=factor(n)[, 1]); prod(k=1, #f, f[k]-1); \\ From A173557 A007947(n) = factorback(factorint(n)[, 1]); \\ From A007947 A318304(n) = (2*A173557(n) - A007947(n)); (PARI) A083254(n) = (2*eulerphi(n)-n); A003557(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 2] = f[i, 2]-1); factorback(f); }; \\ From A003557 A318304(n) = (A083254(n)/A003557(n)); CROSSREFS Cf. A000010, A003557, A007947, A083254, A173557, A318305. Sequence in context: A185390 A019116 A213611 * A318989 A082493 A323912 Adjacent sequences:  A318301 A318302 A318303 * A318305 A318306 A318307 KEYWORD sign AUTHOR Antti Karttunen, Aug 26 2018 STATUS approved

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Last modified April 24 04:20 EDT 2019. Contains 322406 sequences. (Running on oeis4.)