A069117 - OEIS

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A069117

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

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

Table of n, a(n) for n=1..62.

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: A052270 A265335 A179223 * A098464 A068586 A068585

Adjacent sequences: A069114 A069115 A069116 * A069118 A069119 A069120

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 07 2002

STATUS

approved