Search: id:A120947
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%I A120947
%S A120947 2,4,3,6,12,7,8,20,22,5,30,19,10,44,46,27,20,31,68,70,36,26,84,44,48,51,
%T A120947 34,108,55,28,126,132,17,140,75,150,79,164,166,87,36,91,190,96,9,18,212,
%U A120947 74,76,23,116,14,40,84,64,262,15,270,139,140,284,49,308,310,78,159,332
%N A120947 a(n) = smallest m such that n-th prime divides Pell(m).
%C A120947 For all divisors d of n>0, Pell(d) divides Pell(n), so if a prime divides 
               the n-th Pell number, so does it for all multiples of n.
%e A120947 a(4)=6 because the 6th Pell number, 70, is the first that is divisible 
               by the 4th prime (=7).
%Y A120947 Cf. A000129 (Pell numbers), A001602 (equivalent sequence with Fibonacci 
               numbers).
%Y A120947 Sequence in context: A002326 A064273 A134561 this_sequence A046793 A101278 
               A091274
%Y A120947 Adjacent sequences: A120944 A120945 A120946 this_sequence A120948 A120949 
               A120950
%K A120947 nonn
%O A120947 1,1
%A A120947 Ralf Stephan (ralf(AT)ark.in-berlin.de), Aug 19 2006

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