A049448 Sum of numerator and denominator of fractions in Farey tree A007305/A007306.

1, 2, 3, 4, 5, 5, 7, 8, 7, 6, 9, 11, 10, 11, 13, 12, 9, 7, 11, 14, 13, 15, 18, 17, 13, 14, 19, 21, 18, 17, 19, 16, 11, 8, 13, 17, 16, 19, 23, 22, 17, 19, 26, 29, 25, 24, 27, 23, 16, 17, 25, 30, 27, 29, 34, 31, 23, 22, 29, 31, 26, 23, 25, 20, 13, 9, 15, 20, 19, 23

Offset

0,2

References

J. C. Lagarias, Number Theory and Dynamical Systems, pp. 35-72 of S. A. Burr, ed., The Unreasonable Effectiveness of Number Theory, Proc. Sympos. Appl. Math., 46 (1992). Amer. Math. Soc.

Links

Table of n, a(n) for n=0..69.

Formula

A007305+A007306.

Crossrefs

Subset of A007306. Cf. A049465-A049468.

Sequence in context: A073757 A088468 A355729 * A354547 A130044 A156229

Adjacent sequences: A049445 A049446 A049447 * A049449 A049450 A049451

Keyword

nonn,easy,nice,tabf

Author

N. J. A. Sloane, Gregory V. Richardson

Status

approved