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Search: id:A127043
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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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+0
7
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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; listen)
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OFFSET
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1,1
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MATHEMATICA
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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
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Cf. A061002, A034602, A127029, A127042.
Sequence in context: A072330 A097933 A166484 this_sequence A084952 A090433 A022325
Adjacent sequences: A127040 A127041 A127042 this_sequence A127044 A127045 A127046
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Jan 03 2007
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