OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Harmonic Number.
EXAMPLE
A124837(n) begins {1, 7, 47, 57, 459, 341, 3349, 3601, 42131, 44441, ...}.
Thus a(1) = 7, a(2) = 47, a(3) = 42131.
MATHEMATICA
s=3/2; Do[s=s+1/n; f=Numerator[n*(n-1)/2*(s-3/2)]; If[PrimeQ[f], Print[{n-2, f}]], {n, 3, 125}]
CROSSREFS
A124837 are the numerators of third-order harmonic numbers H(n, (3)).
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Nov 11 2006
EXTENSIONS
Crossrefs edited by Michel Marcus, Jul 14 2018
STATUS
approved