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A274053 Least squarefree number that is the sum of a nonzero square and a positive cube in exactly n ways. 0
2, 17, 2089, 27289, 3030569, 6808609, 1632201497 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

a(1) = 2 because 2 = 1^2 + 1^3.

a(2) = 17 because 17 = 4^2 + 1^3 = 3^2 + 2^3.

a(3) = 2089 because 2089 = 45^2 + 4^3 = 33^2 + 10^3 = 19^2 + 12^3.

a(4) = 27289 because 27289 = 29*941 = 165^2 + 4^3 = 129^2 + 22^3 = 108^2 + 25^3 = 17^2 + 30^3.

CROSSREFS

Cf. A005117, A055394, A060835, A122956, A173795.

Sequence in context: A122054 A284706 A092415 * A221207 A274015 A279884

Adjacent sequences:  A274050 A274051 A274052 * A274054 A274055 A274056

KEYWORD

nonn,more

AUTHOR

Altug Alkan, Jun 08 2016

EXTENSIONS

a(6)-a(7) from Giovanni Resta, Jun 12 2016

STATUS

approved

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Last modified June 20 19:27 EDT 2019. Contains 324234 sequences. (Running on oeis4.)