login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A005484 Numerators of convergents to cube root of 7.
(Formerly M2127)
2
1, 2, 21, 44, 725, 1494, 2219, 10370, 22959, 33329, 722868, 756197, 2991459, 15713492, 18704951, 53123394, 71828345, 124951739, 321731823, 3664001792, 18641740783, 22305742575, 85558968508, 107864711083, 301288390674, 8242651259281, 33271893427798, 41514544687079 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, p. 67.

P. Seeling, Verwandlung der irrationalen Groesse ... in einen Kettenbruch, Archiv. Math. Phys., 46 (1866), 80-120.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Numerator[Convergents[7^(1/3), 40]] (* Vincenzo Librandi, Sep 08 2013 *)

PROG

(PARI) a(n)= contfracpnqn(contfrac(7^(1/3), n))[1, 1]; \\ Michel Marcus, Sep 07 2013

CROSSREFS

Cf. A005482, A005485.

Sequence in context: A215753 A041049 A224346 * A042455 A245546 A074875

Adjacent sequences:  A005481 A005482 A005483 * A005485 A005486 A005487

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Herman P. Robinson

EXTENSIONS

More terms from Michel Marcus, Sep 07 2013

Inserted a(27) by Vincenzo Librandi, Sep 08 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 16 19:17 EST 2019. Contains 329201 sequences. (Running on oeis4.)