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a(1) = Mnr - 43 = 808017424794512875886459904961710757005754367999999957 is the nearest prime to Mnr;

a(3) = Mnr + 83 = 808017424794512875886459904961710757005754368000000083 is the smallest prime greater than Mnr; Qremarkable: (a(143),a(141)) = (Mnr-9511,Mnr-9509) is a twin prime pair.