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A345672
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a(n) is the least m such that the decimal expansion of n appears in the concatenation of m, ..., m+k for some k >= 0 and Sum_{i = m..m+k-1} A055642(i) < A055642(n) <= Sum_{i = m..m+k} A055642(i).
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2
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 13, 14, 15, 16, 17, 18, 19, 20, 12, 22, 2, 24, 25, 26, 27, 28, 29, 30, 13, 23, 33, 3, 35, 36, 37, 38, 39, 40, 14, 24, 34, 44, 4, 46, 47, 48, 49, 50, 15, 25, 35, 45, 55, 5, 57, 58, 59, 60, 16, 26, 36, 46, 56, 66, 6, 68
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OFFSET
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0,3
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COMMENTS
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This sequence is similar to A055642; here we consider decimal expansions, there binary expansions.
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LINKS
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FORMULA
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a(n) <= n.
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EXAMPLE
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For n = 21:
- the decimal expansion of 21 first appears in the concatenation of 12 and 13,
- so a(21) = 12.
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PROG
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(PARI) See Links section.
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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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