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A044138
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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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49, 98, 147, 196, 245, 294, 343, 392, 441, 490, 539, 588, 637, 686, 735, 784, 833, 882, 931, 980, 1029, 1078, 1127, 1176, 1225, 1274, 1323, 1372, 1421, 1470, 1519, 1568, 1617, 1666, 1715, 1764, 1813, 1862, 1911, 1960, 2009, 2058, 2107, 2156, 2205, 2254, 2303
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Every element is a multiple of 49. The smallest positive multiple of 49 not in the sequence is 2450. - David W. Wilson (davidwwilson(AT)comcast.net), Aug 03 2005
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LINKS
| Tanya Khovanova, Non Recursions
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MATHEMATICA
| 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
| Sequence in context: A165339 A131601 A174386 * A043394 A044519 A031484
Adjacent sequences: A044135 A044136 A044137 * A044139 A044140 A044141
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KEYWORD
| nonn,base
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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