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 A097427 Integer part of the area of circles with prime radii. 0
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..41. FORMULA a(n) = floor(Pi*prime(n)^2). - Michel Marcus, Mar 11 2015 EXAMPLE a(2) = floor(Pi*prime(2)^2) = floor(Pi*9) = 28. MATHEMATICA Table[Floor[Pi*Prime[n]^2], {n, 60}] (* Wesley Ivan Hurt, Jan 06 2024 *) PROG (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 CROSSREFS Cf. A000040. Sequence in context: A248547 A164533 A034319 * A039366 A043189 A043969 Adjacent sequences: A097424 A097425 A097426 * A097428 A097429 A097430 KEYWORD nonn AUTHOR Cino Hilliard, Aug 22 2004 EXTENSIONS More terms from Wesley Ivan Hurt, Jan 06 2024 STATUS approved

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Last modified April 24 18:15 EDT 2024. Contains 371962 sequences. (Running on oeis4.)