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A227794
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Primes of the form: floor(Pi*n^2).
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1
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3, 113, 907, 3019, 3631, 5281, 6361, 7853, 8171, 11689, 14957, 16741, 17203, 20611, 33329, 36643, 38707, 63347, 68813, 96211, 115811, 126923, 128189, 129461, 169093, 172021, 234139, 241051, 248063, 301907, 319691, 340049, 367453, 380459, 382649, 387047, 448883
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(2)=113: Pi*6^2 = 113.09 and 113 is prime.
a(3)=907: Pi*17^2 = 907.92 and 907 is prime.
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MAPLE
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KD:= proc() local a; a:=floor(evalf( Pi*n^2)); if isprime(a) then RETURN(a): fi; end: seq(KD(), n=1..1000);
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MATHEMATICA
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Select[Floor[Pi*Range[400]^2], PrimeQ] (* Harvey P. Dale, Dec 18 2016 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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