Search: id:A069553
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%I A069553
%S A069553 1,2,6,8,20,18,42,40,63,70,110,84,156,154,180,192,272,234,342,300,378,
%T A069553 418,506,408,575,598,648,644,812,690,930,864,990,1054,1120,1008,1332,
%U A069553 1330,1404,1320,1640,1470,1806,1716,1800,1978,2162,1872,2303,2250,2448
%N A069553 Define S(k) to be the sequence of divisors and multiples of k, e.g. S(1) 
               = 1,2,3,4,5... S(2) = 1,2,4,6,8,10,... S(10) = 1,2,5,10,20,30,40,
               50,...; a(n) = n-th term of the n-th sequence S(n).
%F A069553 a(n) = n*{n - d(n) + 1} where d(n) = number of divisors of n.
%Y A069553 Sequence in context: A124827 A140965 A002618 this_sequence A143481 A093968 
               A064713
%Y A069553 Adjacent sequences: A069550 A069551 A069552 this_sequence A069554 A069555 
               A069556
%K A069553 nonn
%O A069553 1,2
%A A069553 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 22 2002
%E A069553 Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), 
               Sep 29 2003

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