cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A273555 a(n) = A001235(n) - floor(A001235(n)^(1/3))^3.

Original entry on oeis.org

1, 8, 8, 1000, 64, 8, 729, 27, 232, 1728, 64, 216, 1728, 512, 8000, 4913, 729, 27, 125, 512, 64, 5832, 13331, 216, 13580, 125, 4913, 1000, 1856, 3375, 13824, 7073, 343, 2547, 8, 1331, 12167, 512, 1728, 8000, 13824, 13768, 24389, 9736, 16496, 216, 12167, 13824, 19683, 1
Offset: 1

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Author

Altug Alkan, May 25 2016

Keywords

Comments

Noncube terms of this sequence are 232, 13331, 13580, 1856, 7073, 2547, ...
How is the distribution of noncube terms in this sequence? See also A273592 that is related with this question.

Crossrefs

Cf. A001235, A055400, A273592.

Programs

  • PARI
    T = thueinit(x^3+1, 1);
isA001235(n) = my(v=thue(T, n)); sum(i=1, #v, v[i][1]>=0 && v[i][2]>=v[i][1])>1;
lista(nn) = for(n=1, nn, if(isA001235(n), print1(n-sqrtnint(n,3)^3, ", ")));

Formula

a(n) = A055400(A001235(n)). - Michel Marcus, May 25 2016
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