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A049448 Sum of numerator and denominator of fractions in Farey tree A007305/A007306. 3
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 (list; graph; refs; listen; history; text; internal format)
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: A086593 A073757 A088468 * A130044 A156229 A082081

Adjacent sequences:  A049445 A049446 A049447 * A049449 A049450 A049451

KEYWORD

nonn,easy,nice,tabf

AUTHOR

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

STATUS

approved

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Last modified November 13 00:25 EST 2019. Contains 329083 sequences. (Running on oeis4.)