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A127043
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Primes p such that denominator of Sum_{k=1..p-1} 1/k^2} is not a square.
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6
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11, 13, 23, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 101, 103, 107, 109, 113, 137, 139, 149, 151, 157
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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}]]]], 1, AppendTo[a, Prime[x]]], {x, 1, 50}]; a
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CROSSREFS
| Cf. A061002, A034602, A127029, A127042.
Sequence in context: A072330 A097933 A166484 * A084952 A090433 A022325
Adjacent sequences: A127040 A127041 A127042 * A127044 A127045 A127046
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Jan 03 2007
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