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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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A112811 Terms of A110566 grouped.

Original entry on oeis.org

1, 3, 1, 3, 15, 45, 15, 3, 1, 11, 77, 7, 1, 3, 9, 27, 9, 3, 33, 11, 1, 25, 5, 55, 275, 25, 1, 13, 39, 3, 9, 27, 9, 3, 1, 17, 1, 49, 7, 49, 931, 19, 1, 11, 319, 11, 319, 11, 1, 3, 75, 1725, 345, 15, 645, 1935, 5805, 29025, 675, 41175, 13725, 549, 20313, 6771, 183, 3, 411, 15207
Offset: 1

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Author

Robert G. Wilson v, Sep 20 2005

Keywords

Comments

A110566: LCM{1,2,...,n}/denominator of harmonic number H(n).
The factor of change from a(n) to a(n+1) is: 3,3,3,5,3,3,5,3,11,7,11,7,3,3,3,3,3,11,3,11,25,5,11,5,11,25,13,3,13,3,3,3,3,..., . see A110268.

Crossrefs

Cf. A110566, A112812, A110268.

Programs

  • Mathematica
    f[n_] := LCM @@ Range[n]/Denominator[HarmonicNumber[n]]; Flatten[Union /@ Split[Table[f[n], {n, 703}]]]
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