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A097427
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Integer part of the area of circles with prime radii.
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0
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12, 28, 78, 153, 380, 530, 907, 1134, 1661, 2642, 3019, 4300, 5281, 5808, 6939, 8824, 10935, 11689, 14102, 15836, 16741, 19606, 21642, 24884, 29559, 32047, 33329, 35968, 37325, 40114, 50670, 53912, 58964, 60698, 69746, 71631, 77437, 83468, 87615, 94024, 100659
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(2) = floor(Pi*prime(2)^2) = floor(Pi*9) = 28.
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MATHEMATICA
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PROG
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(PARI) f(n) = forprime(x=1, n, print1(floor(Pi*x^2)", "))
(Magma) [Floor(Pi(RealField(2*n))*NthPrime(n)^2): n in [1..80]]; // Vincenzo Librandi, Mar 11 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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