A074043 Denominator of Sum{1/A077800(k)|1<=k<=n}, numerator=A074042.

3, 15, 15, 105, 1155, 15015, 255255, 4849845, 140645505, 4360010655, 178760436855, 7686698784765, 453515228301135, 27664428926369235, 1964174453772215685, 143384735125371745005, 14481858247662546245505

Offset

1,1

Comments

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

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

Links

Table of n, a(n) for n=1..17.

Crossrefs

Essentially the same as A048599.

Sequence in context: A159983 A133227 A237628 * A120467 A323499 A332961

Adjacent sequences: A074040 A074041 A074042 * A074044 A074045 A074046

Keyword

nonn,frac

Author

Reinhard Zumkeller, Aug 13 2002

Extensions

Edited by Max Alekseyev, May 10 2009

Status

approved