The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A028941 Denominator of X-coordinate of n*P where P is generator for rational points on curve y^2+y = x^3-x. 6
 1, 1, 1, 1, 4, 1, 9, 25, 49, 16, 529, 841, 3481, 16641, 98596, 4225, 2337841, 13608721, 67387681, 264517696, 6941055969, 12925188721, 384768368209, 5677664356225, 61935294530404, 49020596163841, 16063784753682169 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Squares of terms in A006769 (or A006720). REFERENCES G. Everest, A. J. van der Poorten, I. Shparlinski and T. Ward, Recurrence Sequences: Examples and Applications, AMS Monographs, 2003 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..212 B. Mazur, Arithmetic on curves, Bull. Amer. Math. Soc. 14 (1986), 207-259; see p. 225. FORMULA This sequence satisfies the quadratic recurrence relation a(n)a(n-6)=-a(n-1)a(n-5)+2a(n-2)a(n-4)+2a(n-3)^2 which is a generalized Somos-6 relation. - Graham Everest (g.everest(AT)uea.ac.uk), Dec 16 2002 P=(0, 0), 2P=(1, 0), if kP=(a, b) then (k+1)P=(a'=(b^2-a^3)/a^2, b'=-1-b*a'/a). CROSSREFS Cf. A028940, A028942, A028943. Sequence in context: A278350 A128626 A193963 * A348180 A176080 A328302 Adjacent sequences:  A028938 A028939 A028940 * A028942 A028943 A028944 KEYWORD nonn AUTHOR 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.

Last modified January 23 11:16 EST 2022. Contains 350512 sequences. (Running on oeis4.)