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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A272375 Negative records in A187202 by index.

Original entry on oeis.org

1, 10, 14, 20, 24, 38, 40, 48, 60, 84, 120, 180, 264, 300, 396, 432, 504, 540, 630, 720, 840, 1320, 2184, 2400, 2772, 3024, 3120, 3360, 3780, 3960, 5940, 6840, 7200, 8400, 9240, 10080, 12600, 15120, 21840, 22680, 25200, 27720, 30240, 40320, 52920, 55440, 83160, 128520, 131040, 138600, 166320, 196560, 221760
Offset: 1

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Author

Robert G. Wilson v, Apr 28 2016

Keywords

Comments

Often a(n)/2 is a member of A242393.
Search limit: 8300000000.

Crossrefs

Programs

  • Mathematica
    f[n_] := (dvr = Divisors@ n; Differences[dvr, Length@ dvr - 1][[1]]); lst = {}; k = 1; mx = 2; While[k < 1000001, a = f@ k; If[a < mx, mx = a; AppendTo[lst, k]]; k++]
Showing 1-1 of 1 results.