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A165951
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If the n-th prime is denoted by p(n) then a(n) = (Sum of the quadratic non-residues of p(n) - Sum of the quadratic residues of p(n)) / p(n)
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5
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0, 0, 0, 1, 1, 0, 0, 1, 3, 0, 3, 0, 0, 1, 5, 0, 3, 0, 1, 7, 0, 5, 3, 0, 0, 0, 5, 3, 0, 0, 5, 5, 0, 3, 0, 7, 0, 1, 11, 0, 5, 0, 13, 0, 0, 9, 3, 7, 5, 0, 0, 15, 0, 7, 0, 13, 0, 11, 0, 0, 3, 0, 3, 19, 0, 0, 3, 0, 5, 0, 0, 19, 9, 0, 3, 17, 0, 0, 0, 0, 9, 0, 21, 0, 15, 5, 0, 0, 0, 7, 7, 25, 7, 9, 3, 21, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,9
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COMMENTS
| Also, a(n) = (sum (floor (j^2/p(n))), j = 1:p(n)-1) - floor ((p(n)-2)(p(n)-1)/3) for n >= 3.
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LINKS
| C. H. Gribble, Table of n, a(n) for n=1,..., 348513 (i.e. for primes < 5x10^6).
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CROSSREFS
| a(3:) = A125616 - A076410.
Sequence in context: A193084 A126598 A127802 * A094901 A030220 A055240
Adjacent sequences: A165948 A165949 A165950 * A165952 A165953 A165954
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KEYWORD
| nonn
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AUTHOR
| Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 01 2009
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EXTENSIONS
| a(1:2) added and cross-reference section modified by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 07 2009
Comment corrected by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 17 2009
Comment corrected by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 29 2009
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