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A079550 Array T(m,n) = phi(m^2)*phi(n^2) - phi(m*n)^2 (m,n >= 1), read by antidiagonals. 3
0, 1, 1, 2, 0, 2, 4, 8, 8, 4, 4, 0, 0, 0, 4, 8, 24, 32, 32, 24, 8, 6, 8, 56, 0, 56, 8, 6, 16, 48, 36, 96, 96, 36, 48, 16, 18, 0, 108, 32, 0, 32, 108, 0, 18, 24, 72, 128, 192, 176, 176, 192, 128, 72, 24, 10, 16, 0, 0, 264, 0, 264, 0, 0, 16, 10, 32, 120, 176, 288, 384, 360, 360, 384, 288 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

It is known that phi(m^2)*phi(n^2) >= phi(m*n)^2.

REFERENCES

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

LINKS

Table of n, a(n) for n=1..75.

CROSSREFS

Cf. A000010, A076953, A079548, A079549.

Sequence in context: A239229 A058210 A274414 * A226430 A067648 A279327

Adjacent sequences:  A079547 A079548 A079549 * A079551 A079552 A079553

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Jan 24 2003

STATUS

approved

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Last modified June 17 17:07 EDT 2019. Contains 324196 sequences. (Running on oeis4.)