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Search: id:A005098
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| A005098 |
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Numbers n such that 4n+1 is prime. |
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20
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| 1, 3, 4, 7, 9, 10, 13, 15, 18, 22, 24, 25, 27, 28, 34, 37, 39, 43, 45, 48, 49, 57, 58, 60, 64, 67, 69, 70, 73, 78, 79, 84, 87, 88, 93, 97, 99, 100, 102, 105, 108, 112, 114, 115, 127, 130, 135, 139, 142, 144, 148, 150, 153, 154, 160, 163, 165, 168, 169, 175, 177, 183
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Sum of i-th and j-th triangular numbers, where i=A096029(n), j=A096030(n);i.e. a(n)=A000217(A096029(n)) + A000217(A096030(n)). - Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 16 2004
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Eric Weisstein's World of Mathematics, Wilson's Theorem
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MAPLE
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a := []; for n from 1 to 500 do if isprime(4*n+1) then a := [op(a), n]; fi; od: A005098 := n->a[n];
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MATHEMATICA
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lst={}; Do[p=4*n+1; If[PrimeQ[p], AppendTo[lst, n]], {n, 0, 10^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 10 2008]
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CROSSREFS
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See A002144 for the actual primes.
Adjacent sequences: A005095 A005096 A005097 this_sequence A005099 A005100 A005101
Sequence in context: A066928 A032726 A029739 this_sequence A002977 A024799 A039579
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 26 2004
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