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A087311
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a(1) = 2; for n>1, a(n) = smallest number == 1 (mod a(n-1)) with a prime signature of n.
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1
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2, 3, 7, 169, 677, 1355, 2711, 4304496906163, 1852869361516769972676380161, 66703297014603719016349685797, 400219782087622314098098114783, 31217143002834540499651652953075, 1498422864136057943983279341747601
(list; graph; refs; listen; history; internal format)
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