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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A293893 Numbers n such that A083722(n) > 1 and A083722(n) occurs later in A083722.

Original entry on oeis.org

24, 120, 140, 528, 2184, 2975, 3146, 3230, 3740, 4180, 4840, 5720, 6498, 11745, 15686, 16800, 19635, 20449, 25270, 28880, 30618, 31200, 31434, 33264, 34075, 41310, 43355, 44590, 50232, 60835, 61236, 61731, 62234
Offset: 1

Views

Author

Antti Karttunen, Nov 02 2017

Keywords

Comments

Equally, numbers n such that A293892(n) > 1 and A293892(n) occurs later in A293892.
Starts like A137799 except that term 3146 is not included in A137799, and furthermore, the latter sequence is not monotonic.
See also comments in A293894.

Crossrefs

Cf. A083722, A137799, A293892, A293894.

A137800 Consider the first run of composites that contains at least two numbers whose largest prime factor is prime(n), n >= 2. a(n) is the second of these numbers.

Original entry on oeis.org

27, 125, 147, 539, 2197, 2992, 3249, 50255, 11774, 15717, 62271, 265680, 172000, 34122, 1133458, 2313744, 1060851, 332387, 1334232, 404931, 1388583, 1357299, 15800793, 5516390, 66896138, 11962935, 6085090, 129761884, 43216624, 90972640
Offset: 2

Views

Author

Enoch Haga, Feb 11 2008

Keywords

Comments

For comments, examples and programs see sequence A137799, which gives the first of these numbers.

Crossrefs

Cf. A137799.

Extensions

Edited and a(18) through a(31) added by Klaus Brockhaus, Feb 15 2008
Showing 1-2 of 2 results.

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