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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A287026 List of pairs of amicable numbers (m, n) with record value of m/n.

Original entry on oeis.org

220, 284, 1184, 1210, 6232, 6368, 10744, 10856, 66928, 66992, 16137628, 16150628, 28118032, 28128368, 766292835, 766512285, 1930301618, 1930741582, 4000783984, 4001351168, 44303273584, 44307987968, 85617896265, 85625175735, 161899964416, 161905117184
Offset: 1

Views

Author

Amiram Eldar, Aug 31 2017

Keywords

Comments

The 2 members in each pair are adjacent to each other in the sequence.
The pairs were found using Sergei Chernykh's Amicable pair list. There are 21 pairs with lesser member < 10^18.

Examples

			The ratios m/n are
                   220/284                 = 0.7746...
                  1184/1210                = 0.9785...
                  6232/6368                = 0.9786...
                 10744/10856               = 0.9896...
                 66928/66992               = 0.9990...
              16137628/16150628            = 0.9991...
              28118032/28128368            = 0.9996...
             766292835/766512285           = 0.99971...
            1930301618/1930741582          = 0.99977...
            4000783984/4001351168          = 0.99985...
           44303273584/44307987968         = 0.99989...
           85617896265/85625175735         = 0.99991...
          161899964416/161905117184        = 0.99996...
          456280713808/456281771312        = 0.999997...
        52326552030976/52326637800704      = 0.999998...
      1132213192149585/1132213862340015    = 0.9999994...
     27117998061385216/27118008762013184   = 0.99999960...
    226615161368838645/226615243086790155  = 0.99999963...
    286707053950093312/286707152546674688  = 0.99999965...
    692760387785689984/692760539319737216  = 0.99999978...
    794879833279366144/794879862664408064  = 0.99999996...
   5462337996254147968/5462338103823900032 = 0.99999998...

Links

Crossrefs

Cf. A063990, A287011.
Cf. A259180 (amicable pairs).

A292020 List of pairs of unitary amicable numbers (m, n) with record low values of m/n.

Original entry on oeis.org

114, 126, 18018, 22302, 32130, 40446, 197340, 286500, 703972667580, 1057831128900
Offset: 1

Views

Author

Amiram Eldar, Sep 07 2017

Keywords

Comments

The 2 members in each pair are adjacent to each other in the sequence.
The unitary version of A287011.

Examples

			The ratios m/n are
114/126 = 0.904...
18018/22302 = 0.807...
32130/40446 = 0.794...
197340/286500 = 0.688...
703972667580/1057831128900 = 0.665...

Crossrefs

Cf. A002952, A002953, A063991, A287011.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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