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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
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OFFSET
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0,3
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LINKS
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MAPLE
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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; # R. J. Mathar, Dec 05 2008
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MATHEMATICA
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a = {1, 1, 2, 2}; Do[AppendTo[a, Prime[PrimePi[a[[ -1]]*a[[ -2]]] + 1]], {7}]; a (* Stefan Steinerberger, Dec 06 2008 *)
nxt[{a_, b_}]:={b, NextPrime[a*b-1]}; NestList[nxt, {1, 1}, 15][[All, 1]] (* Harvey P. Dale, Jun 30 2020 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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