Search: id:A065968
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%I A065968
%S A065968 0,1,2,2,4,7,6,4,6,13,10,14,12,19,22,8,16,21,18,26,32,31,22,28,
%T A065968 20,37,18,38,28,59,30,16,52,49,58,42,36,55,62,52,40,85,42,62,66,
%U A065968 67,46,56,42,65,82,74,52,63,94,76,92,85,58,118,60,91,96,32,112
%N A065968 n * Sum_{primes p dividing n} (1 - 1/p).
%H A065968 Harry J. Smith, <a href="b065968.txt">Table of n, a(n) for n=1,...,1000</
               a>
%o A065968 (PARI) { for (n=1, 1000, s=0; p=2; while (p<=n, if(n%p == 0, s+=1 - 1/
               p); p=nextprime(p + 1)); write("b065968.txt", n, " ", n*s) ) } [From 
               Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 05 2009]
%Y A065968 Sequence in context: A120280 A115754 A162251 this_sequence A105669 A019657 
               A134791
%Y A065968 Adjacent sequences: A065965 A065966 A065967 this_sequence A065969 A065970 
               A065971
%K A065968 nonn
%O A065968 1,3
%A A065968 N. J. A. Sloane (njas(AT)research.att.com), Dec 09 2001

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