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Search: id:A155932
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| A155932 |
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Integers a(n) such that cube(n)-square(x) and cube(n)+square(x) are primes. |
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+0
1
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| 3, 6, 7, 8, 10, 13, 15, 18, 20, 21, 22, 28, 33, 35, 37, 39, 42, 43, 45, 48, 52, 57, 58, 60, 62, 63, 68, 72, 73, 75, 77, 78, 80, 82, 83, 85, 86, 87, 90, 91, 92, 93, 95, 97, 99, 102, 103, 105, 106, 107, 108, 111, 112, 113, 115, 117, 120, 123, 125, 128, 129, 132, 133, 135
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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3^3-2^2=23;3^3+2^2=31, 6^3-5^2=191;6^3+5^2=241, 7^3-6^2=307;7^3+6^2=379, ...
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MATHEMATICA
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lst={}; Do[k=n; c=n^3; Label[ax]; s=k^2; p1=c-s; p2=c+s; If[PrimeQ[p1]&&PrimeQ[p2], AppendTo[lst, n], k--; If[k>0, Goto[ax]]], {n, 2*5!}]; lst
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CROSSREFS
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Cf. A155929, A155930, A155931
Sequence in context: A051205 A050244 A047283 this_sequence A047557 A099850 A157041
Adjacent sequences: A155929 A155930 A155931 this_sequence A155933 A155934 A155935
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 30 2009
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