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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

Table of n, a(n) for n=1..79.

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.)