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A129931
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Numbers n such that n remains prime through 7 iterations of function f(x) = 2x + 5.
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0
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4594309, 4921129, 5495989, 7093057, 14722021, 23008891, 23380471, 24251167, 24296563, 49201981, 51788797, 62123011, 64649503, 69326779, 78274321, 88022797, 95575771, 100099267, 125796127, 128185777, 129299011, 130858711
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| fQ[n_] := Union[PrimeQ /@ NestList[2 # + 5 &, n, 7]] == {True}; lst = {}; Do[ p = Prime@n; If[fQ@p, Print@p; AppendTo[lst, p]], {n, 10^7}]; lst (* Robert G. Wilson v *)
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CROSSREFS
| Cf. A023243, A023274, A023304, A023332.
Sequence in context: A183679 A104950 A152964 * A206195 A083605 A069340
Adjacent sequences: A129928 A129929 A129930 * A129932 A129933 A129934
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KEYWORD
| nonn
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AUTHOR
| Ray G. Opao (1260(AT)email.com), Jun 06 2007
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 06 2007
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