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A322098
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a(1)=1, a(2)=1; for n > 2, a(n) is the largest noncomposite proper divisor of the concatenation of terms a(1) through a(n-1).
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1
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1, 1, 1, 37, 43, 439, 31321, 3555900001, 3555900001, 3563253697383401592719, 3563253697383401592719, 2069957682701324503311258278145695430463576158940397351, 7609174114451381087553287043297264970128251910800933517241956209
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OFFSET
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1,4
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LINKS
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Table of n, a(n) for n=1..13.
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MATHEMATICA
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FromDigits /@ Nest[Append[#, IntegerDigits@ Select[Divisors[FromDigits[Join @@ #]], ! CompositeQ@ # &][[-1]] ] &, {{1}, {1}, {1}}, 7] (* Michael De Vlieger, Nov 26 2018 *)
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CROSSREFS
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Cf. A322097.
Sequence in context: A039950 A186281 A225423 * A039351 A043174 A043954
Adjacent sequences: A322095 A322096 A322097 * A322099 A322100 A322101
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KEYWORD
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nonn,base
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AUTHOR
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John Mason, Nov 26 2018
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EXTENSIONS
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a(12) corrected and a(13) added by Daniel Suteu, Jan 19 2019
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STATUS
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approved
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