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 A295660 Binary weight of Euler phi: a(n) = A000120(A000010(n)). 5
 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 1, 1, 2, 2, 1, 2, 2, 3, 1, 2, 2, 2, 2, 3, 1, 4, 1, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2, 3, 2, 2, 3, 4, 1, 3, 2, 1, 2, 3, 2, 2, 2, 2, 3, 4, 1, 4, 4, 2, 1, 2, 2, 2, 1, 3, 2, 3, 2, 2, 2, 2, 2, 4, 2, 4, 1, 4, 2, 3, 2, 1, 3, 3, 2, 3, 2, 2, 3, 4, 4, 2, 1, 2, 3, 4, 2, 3, 1, 4, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = A000120(A000010(n)). MATHEMATICA Array[DigitCount[EulerPhi@ #, 2, 1] &, 105] (* Michael De Vlieger, Nov 27 2017 *) PROG (PARI) A295660(n) = hammingweight(eulerphi(n)); (Scheme) (define (A295660 n) (A000120 (A000010 n))) CROSSREFS Cf. A000010, A000120, A175548, A293516. Cf. A003401 (gives the positions of ones). Sequence in context: A160978 A231776 A055734 * A193169 A193453 A227944 Adjacent sequences:  A295657 A295658 A295659 * A295661 A295662 A295663 KEYWORD nonn AUTHOR Antti Karttunen, Nov 27 2017 STATUS approved

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Last modified September 25 15:04 EDT 2021. Contains 347657 sequences. (Running on oeis4.)