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 A079533 Floor(n - sqrt(n)) - phi(n) as n runs through the composite numbers (A002808). 2
 0, 1, 1, 0, 2, 4, 4, 3, 4, 7, 7, 4, 7, 11, 0, 8, 3, 10, 16, 10, 7, 12, 5, 18, 13, 8, 17, 23, 17, 14, 17, 25, 0, 22, 11, 20, 28, 7, 24, 13, 22, 36, 24, 19, 24, 8, 37, 27, 16, 37, 39, 29, 26, 31, 8, 45, 39, 18, 32, 50, 11, 34, 21, 38, 56, 9, 38, 23, 38, 13, 54, 46, 29, 50, 59, 45, 46, 43, 61 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS It is known that a(n) >= 0. REFERENCES D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 9. W. Sierpiński, Elementary Theory of Numbers. Państ. Wydaw. Nauk., Warsaw, 1964. LINKS W. Sierpiński, Elementary Theory of Numbers, Warszawa 1964. PROG (PARI) lista(nn) = forcomposite(n=1, nn, print1(floor(n - sqrt(n)) - eulerphi(n), ", ")); \\ Michel Marcus, Dec 12 2014 CROSSREFS Cf. A000010, A079530, A079531, A079532, A079534. Sequence in context: A257978 A193358 A214028 * A072872 A135359 A098217 Adjacent sequences:  A079530 A079531 A079532 * A079534 A079535 A079536 KEYWORD nonn AUTHOR N. J. A. Sloane, Jan 23 2003 STATUS approved

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Last modified May 16 14:39 EDT 2021. Contains 343949 sequences. (Running on oeis4.)