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A079549 Array T(m,n) = m*phi(n) - phi(mn) (m,n >= 1), read by antidiagonals. 3
0, 1, 0, 1, 0, 0, 2, 1, 2, 0, 1, 0, 0, 0, 0, 4, 1, 4, 2, 4, 0, 1, 2, 2, 0, 4, 0, 0, 4, 1, 6, 2, 8, 0, 6, 0, 3, 0, 2, 4, 0, 0, 6, 0, 0, 6, 3, 8, 2, 16, 2, 12, 4, 6, 0, 1, 2, 0, 0, 4, 0, 6, 0, 0, 0, 0, 8, 1, 12, 6, 16, 2, 24, 4, 12, 4, 10, 0, 1, 4, 2, 4, 12, 0, 0, 8, 6, 0, 10, 0, 0, 8, 1, 12, 2, 20, 0, 24, 4, 18 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

It follows from the definition that m*phi(n) - phi(mn) >= 0.

REFERENCES

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 9.

LINKS

Table of n, a(n) for n=1..100.

CROSSREFS

Cf. A000010, A076953, A079548, A079550.

Sequence in context: A317902 A317871 A082995 * A143374 A277899 A283760

Adjacent sequences:  A079546 A079547 A079548 * A079550 A079551 A079552

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Jan 24 2003

STATUS

approved

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Last modified May 23 20:23 EDT 2019. Contains 323528 sequences. (Running on oeis4.)