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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
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(3) = 7 has the prime signature of 3 and a(4) = 169 has the prime signature of 4 and 169 == 1 (mod 7).
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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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