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A074043 Denominator of Sum{1/A077800(k)|1<=k<=n}, numerator=A074042. 1
3, 15, 15, 105, 1155, 15015, 255255, 4849845, 140645505, 4360010655, 178760436855, 7686698784765, 453515228301135, 27664428926369235, 1964174453772215685, 143384735125371745005, 14481858247662546245505 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

For n>2, a(n) = A048599(n-1).

A074042(n)/a(n) -> Brun's constant (A065421).

CROSSREFS

Essentially the same as A048599.

Sequence in context: A096672 A159983 A133227 * A120467 A012634 A043060

Adjacent sequences:  A074040 A074041 A074042 * A074044 A074045 A074046

KEYWORD

nonn,frac

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 13 2002

EXTENSIONS

Edited by Max Alekseyev (maxale(AT)gmail.com), May 10 2009

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Last modified February 14 06:20 EST 2012. Contains 205570 sequences.