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A152445
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a(0) = a(1) = 1. For n >= 2, a(n) = the smallest prime >= a(n-1)*a(n-2).
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2
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1, 1, 2, 2, 5, 11, 59, 653, 38543, 25168589, 970072925867, 24415366771173991757, 23684686279828682858246730078719, 578270302382209771209755703072864217352250067119367
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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MAPLE
| A152445 := proc(n) option remember ; if n <= 1 then 1; else nextprime(procname(n-1)*procname(n-2)-1) ; fi; end: for n from 0 to 15 do printf("%d, ", A152445(n)) ; od; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 05 2008]
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MATHEMATICA
| a = {1, 1, 2, 2}; Do[AppendTo[a, Prime[PrimePi[a[[ -1]]*a[[ -2]]] + 1]], {7}]; a [From Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Dec 06 2008]
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CROSSREFS
| A152446
Sequence in context: A049680 A153983 A058021 * A077182 A143195 A192799
Adjacent sequences: A152442 A152443 A152444 * A152446 A152447 A152448
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Dec 04 2008
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EXTENSIONS
| Extended beyond a(7) by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Stefan Steinerberger (stefan.steinerberger(AT)gmail.com) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 05 2008
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