Search: a066217 -id:a066217
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A332795
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Lexicographically earliest sequence of distinct positive terms such that a(n) and a(n+1) are substrings of their product.
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+10
7
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1, 10, 11, 100, 21, 1000, 31, 10000, 41, 100000, 51, 1000000, 61, 10000000, 71, 100000000, 81, 2817
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OFFSET
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1,2
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COMMENTS
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a(19) = 87281795511221945137157107231920199501246882793017456359
1022443890274314214463840399002493765586034912718204488778054862
8428927680798004987531172069825436408977556109725685785536159601,
which is too large (184 digits) to be included in Data.
Here a(18)*a(19) = 245|a(19)|7 = 24587|a(18)|955... where | denotes digit concatenation. (End)
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LINKS
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EXAMPLE
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a(1)*a(2) = 1*10 = 10 and 10 contains the substrings 1 and 10, which are precisely a(1) and a(2);
a(17)*a(18) = 81*2817 = 228177 and 228177 contains the substrings 81 and 2817, which are precisely a(17) and a(18).
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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