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 A160234 Number of n-digit "early bird numbers" A116700. 0
 0, 45, 630, 6896, 73059 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE a(1)= 0 because there are no 1d terms in A116700 a(1)= 45 because there are 45 2d terms in A116700: 12,21,23,31,32,34,41,42,43,45,51,52,53,54,56,61,62,63,64,65,67,71,72,73,74,75,76,78,81,82,83,84,85,86,87,89,91,92,93,94,95,96,97,98,99. MATHEMATICA s="1"; ss={}; Do[tsn=ToString[n]; If[ !StringFreeQ[s, tsn], AppendTo[ss, n]]; s=s<>tsn, {n, 2, 99999}]; Table[Length[Select[ss, 10^(n-1)<=#<10^n&]], {n, 1, 5}] CROSSREFS A116700 "Early bird" numbers. Sequence in context: A189350 A090024 A282767 * A110691 A296540 A105251 Adjacent sequences:  A160231 A160232 A160233 * A160235 A160236 A160237 KEYWORD base,nonn AUTHOR Zak Seidov, May 04 2009 STATUS approved

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Last modified May 11 18:21 EDT 2021. Contains 343808 sequences. (Running on oeis4.)