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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A352710 Least k such that A352483(k) = 2*n-1, or -1 if no such k exists.

Original entry on oeis.org

3, 5, 7, 20, 11, 13, 32, 17, 19, 44, 23, 27, 216, 29, 31, 35, 280, 37, 117, 41, 43, 92, 47, 51, 153, 53, 57, 116, 59, 61, 65, 520, 67, 207, 71, 73, 77, 616, 79, 164, 83, 87, 261, 89, 93, 95, 760, 97, 105, 101, 103, 212, 107, 109, 333, 113, 920, 119, 952, 123, 125, 1000, 127, 135, 131
Offset: 1

Views

Author

Michel Marcus, Mar 30 2022

Keywords

Crossrefs

Cf. A352483.
Bisection of A351913.

Programs

  • PARI
    f(n) = my(d=numdiv(n)); denominator(n*d/(n-d)); \\ A352483
    a(n) = {my(k=3, q=2*n-1); while (f(k) != q, k++); k; }

Formula

a(n) = A351913(2*n-1).
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