A137800 - OEIS

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.

%I #3 Mar 31 2012 10:32:41

%S 27,125,147,539,2197,2992,3249,50255,11774,15717,62271,265680,172000,

%T 34122,1133458,2313744,1060851,332387,1334232,404931,1388583,1357299,

%U 15800793,5516390,66896138,11962935,6085090,129761884,43216624,90972640

%N 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.

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

%Y Cf. A137799.

%K nonn

%O 2,1

%A _Enoch Haga_, Feb 11 2008

%E Edited and a(18) through a(31) added by _Klaus Brockhaus_, Feb 15 2008