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A132414 Integers n such that n^3 - (n + 2)^2 + n + 4 is a square. 3
-1, 0, 3, 4, 75 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

n^3 - (n + 2)^2 + n + 4 = n^3 - n^2 - 3*n. The set of x values of integral solutions to the elliptic curve y^2 = n^3 - n^2 - 3*n (see Magma program) is {-1, 0, 3, 4, 75}. - Klaus Brockhaus, Nov 13 2007

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

0^3 - 2^2 + 4 = 0^2, 3^3 - 5^2 + 7 = 3^2, 4^3 - 6^2 + 8 = 6^2 and 75^3 - 77^2 + 79 = 645^2.

PROG

(MAGMA) P<n> := PolynomialRing(Integers()); {x: x in Sort([ p[1] : p in IntegralPoints(EllipticCurve(n^3 - n^2 - 3*n)) ])}; /* Klaus Brockhaus, Nov 13 2007 */

CROSSREFS

Cf. A005563, A028560.

Sequence in context: A052323 A012087 A012194 * A041171 A279935 A111799

Adjacent sequences:  A132411 A132412 A132413 * A132415 A132416 A132417

KEYWORD

sign,fini,full

AUTHOR

Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Nov 12 2007

STATUS

approved

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Last modified December 11 14:03 EST 2017. Contains 295884 sequences.