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A044178
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Numbers n such that string 5,5 occurs in the base 7 representation of n but not of n-1.
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0
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40, 89, 138, 187, 236, 280, 334, 383, 432, 481, 530, 579, 623, 677, 726, 775, 824, 873, 922, 966, 1020, 1069, 1118, 1167, 1216, 1265, 1309, 1363, 1412, 1461, 1510, 1559, 1608, 1652, 1706, 1755, 1804, 1853, 1902, 1951, 1960
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {5, 5}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 16 2017 *)
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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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