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Search: id:A127720
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| A127720 |
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Floor of square root of sum of squares of n odd consecutive primes. |
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+0
5
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| 3, 5, 9, 14, 19, 25, 31, 39, 48, 57, 68, 80, 90, 102, 115, 129, 143, 157, 173, 187, 203, 220, 237, 256, 275, 294, 313, 331, 350, 372, 394, 418, 440, 465, 488, 513, 538, 564, 590, 616, 642, 670, 697, 724, 751, 780, 811, 843, 873
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = A000196[A024450(n+1)-4]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 28 2007
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MAPLE
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A024450 := proc(n) local i ; add((ithprime(i))^2, i=1..n) ; end: Ax := proc(n) A024450(n+1)-4 ; end: A000196 := proc(n) floor(sqrt(n)) ; end: A127720 := proc(n) A000196(Ax(n)) ; end: for n from 1 to 30 do printf("%d, ", A127720(n)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 28 2007
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MATHEMATICA
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a = {}; k = 0; Do[k = k + (Prime[x])^2; AppendTo[a, Floor[Sqrt[k]]], {x, 2, 50}]; a
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CROSSREFS
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Cf. A127719, A127721.
Sequence in context: A133033 A134672 A082874 this_sequence A118002 A069533 A054066
Adjacent sequences: A127717 A127718 A127719 this_sequence A127721 A127722 A127723
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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 25 2007
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