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A044519
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Numbers n such that string 0,0 occurs in the base 7 representation of n but not of n+1.
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0
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49, 98, 147, 196, 245, 294, 349, 392, 441, 490, 539, 588, 637, 692, 735, 784, 833, 882, 931, 980, 1035, 1078, 1127, 1176, 1225, 1274, 1323, 1378, 1421, 1470, 1519, 1568, 1617, 1666, 1721, 1764, 1813, 1862, 1911, 1960, 2009, 2064, 2107, 2156, 2205, 2254, 2303
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..47.
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MATHEMATICA
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f[n_] := Length[StringPosition[ToString[FromDigits[IntegerDigits[n, 7]]], "00", 1]]; Select[Table[n, {n, 10000}], f[#] > 0 && f[# + 1] == 0 &] (* From Vladimir Joseph Stephan Orlovsky, Jul 23 2011 *)
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CROSSREFS
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Cf. A044138.
Sequence in context: A174386 A044138 A043394 * A031484 A114013 A161689
Adjacent sequences: A044516 A044517 A044518 * A044520 A044521 A044522
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KEYWORD
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nonn,base
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AUTHOR
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Clark Kimberling
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STATUS
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approved
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