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 A069117 Numbers n such that A068589(n) is a perfect square. 0
 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, 65, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 105, 106, 107, 108, 109, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 189, 190, 191, 192, 193, 194, 195 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS PROG (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, ", "))) CROSSREFS Sequence in context: A182945 A052270 A179223 * A098464 A068586 A068585 Adjacent sequences:  A069114 A069115 A069116 * A069118 A069119 A069120 KEYWORD easy,nonn AUTHOR Benoit Cloitre, Apr 07 2002 STATUS approved

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