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A270040 a(n) = Smallest m >= 9 containing no fours when represented in any base from 5 through n. 10
10, 11, 12, 13, 15, 15, 17, 17, 66, 75, 75, 86, 86, 90, 138, 138, 138, 138, 138, 138, 138, 138, 138, 182, 182, 182, 182, 182, 182, 182, 182, 182, 185, 781817578165, 781817578165, 7826560751018861596150680 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,1
COMMENTS
It remains to be determined if the sequence is finite.
These numbers are not very Foury, at least not initially. (See A268236.)
LINKS
MATHEMATICA
Table[SelectFirst[Range[9, 10^3], Total@ Map[Function[k, DigitCount[#, k, 4]], Range[5, n]] == 0 &], {n, 5, 60}] /. n_ /; MissingQ@ n -> Nothing (* Michael De Vlieger, Mar 10 2016, Version 10.2 *)
CROSSREFS
Sequence in context: A008707 A089951 A058945 * A339093 A072554 A138582
KEYWORD
nonn,base
AUTHOR
Nathan Fox, Mar 09 2016
STATUS
approved

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Last modified April 23 07:16 EDT 2024. Contains 371905 sequences. (Running on oeis4.)