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.

Showing 1-2 of 2 results.

A193945 Integers n such that for all i > n the largest prime factor of i(i+1)(i+2)(i+3) exceeds the largest prime factor of n(n+1)(n+2)(n+3).

Original entry on oeis.org

1, 3, 7, 9, 63, 168, 322, 1518, 1680, 10878, 17575, 70224, 97524, 224846, 612360, 15473807, 61011223, 108384553, 137308589, 999208250, 1497820158, 22377473780, 238092971076, 316419292600, 23931257472314
Offset: 1

Views

Author

Andrey V. Kulsha, Aug 10 2011

Keywords

Comments

Heuristics show that these terms are valid, but a strict proof is yet to be done.
a(1)-a(11) verified via Størmer's theorem. - Charles R Greathouse IV, Feb 19 2013

Links

Crossrefs

Cf. A003033, A193944, A193946, A145605.

A193943 Integers n such that for all i > n the largest prime factor of i*(i+1) exceeds the largest prime factor of n*(n+1).

Original entry on oeis.org

1, 8, 80, 4374, 9800, 123200, 336140, 11859210, 177182720, 1611308699, 3463199999, 63927525375, 421138799639, 1109496723125, 1453579866024, 20628591204480, 31887350832896, 119089041053696, 2286831727304144, 9591468737351909375, 19316158377073923834000
Offset: 1

Views

Author

Andrey V. Kulsha, Aug 11 2011, according to Jim White's computations

Keywords

Links

Crossrefs

Cf. A002072, A145606, A193944.

Extensions

Corrected 23rd term in b-file (see Blog link), Andrey V. Kulsha, Dec 22 2014
a(20) and a(21) added (from b-file) by Jon E. Schoenfield, Apr 22 2018
Showing 1-2 of 2 results.

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

Content is available under The OEIS End-User License Agreement.