A193943 - OEIS

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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).

2

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Andrey V. Kulsha, Table of n, a(n) for n = 1..23

liangbch, consecutive pairs of smooth numbers, Blog.

CROSSREFS

Cf. A002072, A145606, A193944.

Sequence in context: A240325 A145606 A002072 * A067449 A302974 A281472

Adjacent sequences: A193940 A193941 A193942 * A193944 A193945 A193946

KEYWORD

nonn

AUTHOR

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

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

STATUS

approved