A099592 - OEIS

%I #5 May 09 2018 05:13:54

%S 1260,330,210,120,90,78,66,60,60,60,42,42,42,42,42,42,42,42,42,30,30,

%T 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,

%U 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30

%N Minimum index i of certain Lucas (or Lehmer) sequences such that every element with index >= i has a primitive divisor.

%C For n>20, a(n) = 30.

%H P. M. Voutier, <a href="http://www.numdam.org/item?id=JTNB_1996__8_2_251_0">Primitive divisors of Lucas and Lehmer sequences</a>, Journal de théorie des nombres de Bordeaux, Tome 8 (1996) no. 2 , p. 251-274.

%K nonn

%O 2,1

%A _Ralf Stephan_, Oct 26 2004