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Search: id:A079592
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| A079592 |
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Primes for which floor(pi*x) is prime. |
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1
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| 17, 19, 31, 61, 71, 73, 101, 229, 241, 311, 313, 331, 373, 401, 499, 541, 569, 797, 821, 863, 881, 911, 919, 967, 1009, 1051, 1093, 1217, 1249, 1289, 1303, 1427, 1459, 1471, 1583, 1667, 1753, 1811, 1879, 1979, 2011, 2053, 2063, 2153
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OFFSET
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0,1
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EXAMPLE
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floor(pi*2)=6, which is not prime. floor(pi*3)=9, which is not prime. floor(pi*5)=15, which is not prime. The smallest prime x for which floor(pi*x) is prime is 17, so a(1)=17. (floor(pi*17)=53)
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MATHEMATICA
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For[i = 1, i < 1000, If[PrimeQ[IntegerPart[Pi*Prime[i]]] == True, Print[Prime[i]]]; i++ ]
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CROSSREFS
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Sequence in context: A098933 A145485 A085106 this_sequence A160027 A144213 A144214
Adjacent sequences: A079589 A079590 A079591 this_sequence A079593 A079594 A079595
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KEYWORD
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nonn
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AUTHOR
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N. Fernandez (primeness(AT)borve.org), Jan 27 2003
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