OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
a = {}; Do[If[Sqrt[Denominator[Sum[1/x^2, {x, 1, Prime[x] - 1}]]] == Floor[Sqrt[Denominator[Sum[1/x^2, {x, 1, Prime[x] - 1}]]]], AppendTo[a, Prime[x]]], {x, 1, 50}]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 03 2007
EXTENSIONS
More terms from Franklin T. Adams-Watters, Jan 21 2012
STATUS
approved