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A238753 Squarefree integers D such that Q(sqrt(D)) contains a non-constant arithmetic progression of 5 squares. 0
409, 4688329, 250545884330641, 199554894091303668073201, 231574628370557219024862837633967849, 30240048139343876249762998173442832362876517638009, 330823513952828243573122480536077533156064000139119724642295861921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note that there exists no D such that Q(sqrt{D}) contains a non-constant arithmetic progression of 6 squares.

LINKS

Table of n, a(n) for n=1..7.

Enrique González-Jiménez and Xavier Xarles, Five squares in arithmetic progression over quadratic fields, arXiv:0909.1663 [math.NT]

EXAMPLE

For n=1, D=409 and such an arithmetic progression is 49,169,289,409,529.

CROSSREFS

Sequence in context: A107625 A061333 A262636 * A157431 A179129 A176598

Adjacent sequences:  A238750 A238751 A238752 * A238754 A238755 A238756

KEYWORD

nonn

AUTHOR

David Cushing, Mar 04 2014

STATUS

approved

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Last modified October 18 07:19 EDT 2019. Contains 328146 sequences. (Running on oeis4.)