English

General solutions of sums of consecutive cubed integers equal to squared integers

Number Theory 2015-01-27 v1

Abstract

All integer solutions (M,a,c)\left(M,a,c\right) to the problem of the sums of MM consecutive cubed integers (a+i)3\left(a+i\right)^{3} (a>1a>1, 0iM10\leq i\leq M-1) equaling squared integers c2c^{2} are found by decomposing the product of the difference and sum of the triangular numbers of (a+M1)\left(a+M-1\right) and (a1)\left(a-1\right) in the product of their greatest common divisor gg and remaining square factors δ2\delta^{2} and σ2\sigma^{2}, yielding c=gδσc=g\delta\sigma. Further, the condition that gg must be integer for several particular and general cases yield generalized Pell equations whose solutions allow to find all integer solutions (M,a,c)\left(M,a,c\right) showing that these solutions appear recurrently. In particular, it is found that there always exist at least one solution for the cases of all odd values of MM, of all odd integer square values of aa, and of all even values of MM equal to twice an integer square.

Keywords

Cite

@article{arxiv.1501.06098,
  title  = {General solutions of sums of consecutive cubed integers equal to squared integers},
  author = {Vladimir Pletser},
  journal= {arXiv preprint arXiv:1501.06098},
  year   = {2015}
}

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19 pages