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A058023 a(n) is the largest prime < A051451(n) - 1.

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%I A058023 #18 Aug 27 2024 09:15:13
%S A058023 3,7,53,409,829,2503,27701,360337,720703,12252197,232792501,
%T A058023 5354228843,26771144371,80313433159,2329089562747,72201776446757,
%U A058023 144403552893563,5342931457063157,219060189739591153,9419588158802421517,442720643463713815129
%N A058023 a(n) is the largest prime < A051451(n) - 1.
%C A058023 This is a companion to A058019.
%H A058023 Amiram Eldar, <a href="/A058023/b058023.txt">Table of n, a(n) for n = 3..377</a>
%e A058023 A051451(6) = 420, 420 - 1 = 419 is preceded by the prime 409, so a(6) = 409.
%t A058023 NextPrime[Rest@ FoldList[LCM, Select[Range[50], PrimePowerQ]] - 1, -1] (* _Amiram Eldar_, Aug 27 2024 *)
%Y A058023 Cf. A000961, A003418, A051451, A058019.
%K A058023 nonn
%O A058023 3,1
%A A058023 _Labos Elemer_, Nov 15 2000
%E A058023 Edited by _N. J. A. Sloane_, Aug 20 2021