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A068585 Numbers k such that the denominator of (Sum_{j=1..k} 1/j)^3 equals the denominator of Sum_{j=1..k} 1/j^3. 1
1, 2, 3, 4, 5, 9, 10, 11, 12, 13, 14, 15, 16, 17, 27, 28, 29, 30, 31, 32, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 289, 290, 291, 292, 293, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011, 1012, 1013 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..59.

FORMULA

Numbers k such that A002805(k)^3 = A007409(k).

CROSSREFS

Sequence in context: A069117 A098464 A068586 * A037472 A096304 A119955

Adjacent sequences:  A068582 A068583 A068584 * A068586 A068587 A068588

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 27 2002

STATUS

approved

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Last modified September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)