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A058023 a(n) = largest prime < A051451(n) - 1 1

%I

%S 3,7,53,409,829,2503,27701,360337,720703,12252197,232792501,

%T 5354228843,26771144371,80313433159,2329089562747,72201776446757,

%U 144403552893563,5342931457063157,219060189739591153,9419588158802421517,442720643463713815129

%N a(n) = largest prime < A051451(n) - 1

%C This is a companion to A058019.

%e A051451(6) = 420, 420-1=419 is preceded by the prime 409, so a(6) = 409.

%Y Cf. A000961, A003418, A051451.

%K sign

%O 3,1

%A _Labos Elemer_, Nov 15 2000

%E Edited by _N. J. A. Sloane_, Aug 20 2021

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Last modified September 24 15:33 EDT 2021. Contains 347643 sequences. (Running on oeis4.)