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Search: id:A143245
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| 3, 5, 7, 13, 11, 17, 29, 23, 31, 41, 37, 53, 61, 43, 47, 97, 113, 73, 101, 67, 83, 107, 71, 127, 193, 233, 197, 229, 181, 173, 131, 163, 227, 251, 199, 167, 151, 223, 257, 449, 353, 337, 433, 409, 313, 421, 277, 373, 269, 461, 349, 509, 307, 331, 491, 283, 443
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Weisstein, Eric W. "Gray Code." http : // mathworld.wolfram.com/GrayCode.html
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FORMULA
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a(n)=If[PrimeQ[A098957(n)],A098957(n)].
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MATHEMATICA
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GrayCodeList[k_] := Module[{b = IntegerDigits[k, 2], i}, Do[ If[b[[i - 1]] == 1, b[[i]] = 1 - b[[i]]], {i, Length[b], 2, -1} ]; b ]; a[n_] = GrayCodeList[Prime[n]]; a0 = Table[Sum[a[n][[m + 1]]*2^m, {m, 0, Length[a[n]] - 1}], {n, 1, 200}]; Flatten[Table[If[PrimeQ[a0[[n]]], a0[[n]], {}], {n, 1, 200}]]
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CROSSREFS
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Cf. A098957.
Sequence in context: A161329 A111745 A098957 this_sequence A018205 A121047 A152075
Adjacent sequences: A143242 A143243 A143244 this_sequence A143246 A143247 A143248
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KEYWORD
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nonn,uned,probation
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AUTHOR
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Roger L. Bagula and Gary W. Adamson (rlbagulatftn(AT)yahoo.com), Oct 21 2008
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