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A069117 Numbers n such that A068589(n) is a perfect square. 0

%I #6 Mar 30 2012 18:38:56

%S 1,2,3,4,5,9,10,11,12,13,14,15,16,17,21,22,23,27,28,29,30,31,32,63,64,

%T 65,88,89,90,91,92,93,94,95,96,97,98,99,105,106,107,108,109,136,137,

%U 138,139,140,141,142,143,144,145,146,147,189,190,191,192,193,194,195

%N Numbers n such that A068589(n) is a perfect square.

%o (PARI) precision 1000 digits : for(n=1,300,if(sqrt(denominator(sum(i=1,n,1/i^3))/denominator(sum(i=1,n,1/i))) == floor(sqrt(denominator(sum(i=1,n,1/i^3))/denominator(sum(i=1,n,1/i)))),print1(n,",")))

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Apr 07 2002

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Last modified March 28 11:44 EDT 2024. Contains 371241 sequences. (Running on oeis4.)