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A044519 Numbers n such that string 0,0 occurs in the base 7 representation of n but not of n+1. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
f[n_] := Length[StringPosition[ToString[FromDigits[IntegerDigits[n, 7]]], "00", 1]]; Select[Table[n, {n, 10000}], f[#] > 0 && f[# + 1] == 0 &] (* Vladimir Joseph Stephan Orlovsky, Jul 23 2011 *)
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {0, 0}]>0, 1, 0], {n, 2500}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 27 2021 *)
CROSSREFS
Cf. A044138.
Sequence in context: A174386 A044138 A043394 * A031484 A260009 A114013
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified July 15 00:00 EDT 2024. Contains 374323 sequences. (Running on oeis4.)