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A215884
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Written in base 5, n ends in a(n) consecutive nonzero digits.
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4
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0, 1, 1, 1, 1, 0, 2, 2, 2, 2, 0, 2, 2, 2, 2, 0, 2, 2, 2, 2, 0, 2, 2, 2, 2, 0, 1, 1, 1, 1, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 1, 1, 1, 1, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 1, 1, 1, 1, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 3, 3, 3, 3, 0, 1, 1, 1, 1, 0, 3
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OFFSET
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0,7
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COMMENTS
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Sequences A215879, A215883 and A215887 are the base 3, 4 and 10 analogs, while the base 2 analog of this sequence coincides (up to a shift in the index) with the 2-adic valuation A007814, cf. comments there.
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LINKS
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EXAMPLE
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The numbers 24,...,31 are written in base 5 as 44,100,101,102,103,104,110,111 and thus end in a string of a(24..31)=2,0,1,1,1,1,0,3 nonzero digits.
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MATHEMATICA
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cnzd[n_]:=Module[{c=Split[If[#>0, 1, 0]&/@IntegerDigits[n, 5]]}, If[FreeQ[ c[[-1]], 0], Total[c[[-1]]], 0]]; Array[cnzd, 120, 0] (* Harvey P. Dale, Jan 03 2023 *)
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PROG
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(PARI) a(n, b=5)=n=divrem(n, b); for(c=0, 9e9, n[2]||return(c); n=divrem(n[1], b))
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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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