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Search: id:A121543
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| A121543 |
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Sequence: "if n appears then n-th prime doesn't", case a(1)=1. |
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+0
1
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| 1, 3, 4, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 67, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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(* two versions:*) (* first*) s={1}; Do[If[ !PrimeQ[n]||(PrimeQ[n]&&FreeQ[s, PrimePi[n]]), AppendTo[s, n]], {n, 2, 100}]; s (* Zak Seidov *) (* 2nd *) Table[Prime[Prime[Floor[GoldenRatio*n]]], {n, 1, 20}]; Select[Prime[Range[PrimePi[Last[%]]]], !MemberQ[%, # ]&]; Select[Range[Last[%]], !MemberQ[%, # ]&] (* Joseph Biberstine *)
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CROSSREFS
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Sequence in context: A072152 A069211 A099356 this_sequence A080702 A090864 A118300
Adjacent sequences: A121540 A121541 A121542 this_sequence A121544 A121545 A121546
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Aug 06 2006
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