

A266230


Least positive integer x such that n + x^2 = y^3 + z^3 for some positive integers y and z, or 0 if no such x exists.


10



3, 1, 3703, 5, 43, 2, 119, 3, 1, 19, 5, 384, 2, 29, 29, 1, 7, 18, 6, 3, 13, 14, 869, 7, 2, 15, 3, 1, 10, 5, 23, 2, 20, 10, 1, 45, 6, 2373, 4, 1193, 5, 52, 7, 36, 54, 3, 18, 5, 13, 4, 2, 385, 9, 1, 14, 6, 3, 76, 250, 250, 34, 2, 8, 3, 1, 336, 5, 52, 2, 8, 28, 1, 21, 12, 13, 4, 113
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OFFSET

0,1


COMMENTS

Conjecture: For any integer m, there are positive integers x, y and z such that m + x^2 = y^3 + z^3.
This is similar to the conjecture in A266152. We have verified it for all integers m with m <= 25000.
Obviously, a(k^3) = 1 for any positive integer k.
See also A266231 for a related sequence.


LINKS



EXAMPLE

a(0) = 3 since 0 + 3^2 = 1^3 + 2^3.
a(2) = 3703 since 2 + 3703^2 = 107^3 + 232^3.
a(3) = 5 since 3 + 5^2 = 1^3 + 3^3.
a(4) = 43 since 4 + 43^2 = 5^3 + 12^3.
a(37) = 2373 since 37 + 2373^2 = 93^3 + 169^3.
a(1227) = 132316 since 1227 + 132316^2 = 1874^3 + 2219^3.


MATHEMATICA

CQ[n_]:=CQ[n]=IntegerQ[n^(1/3)]
Do[x=1; Label[bb]; Do[If[CQ[n+x^2y^3], Print[n, " ", x]; Goto[aa]], {y, 1, ((n+x^2)/2)^(1/3)}]; x=x+1; Goto[bb]; Label[aa]; Continue, {n, 0, 80}]


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



