A044250 - OEIS

A044250

Numbers n such that string 7,7 occurs in the base 8 representation of n but not of n-1.

63, 127, 191, 255, 319, 383, 447, 504, 575, 639, 703, 767, 831, 895, 959, 1016, 1087, 1151, 1215, 1279, 1343, 1407, 1471, 1528, 1599, 1663, 1727, 1791, 1855, 1919, 1983, 2040, 2111, 2175, 2239, 2303, 2367, 2431, 2495, 2552

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OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..2000

MATHEMATICA

Select[Range[3000], MemberQ[Partition[IntegerDigits[#, 8], 2, 1], {7, 7}] && !MemberQ[Partition[IntegerDigits[#-1, 8], 2, 1], {7, 7}]&] (* Harvey P. Dale, Feb 22 2014 *)

CROSSREFS

Sequence in context: A045064 A043450 A031491 * A044631 A045136 A031895

Adjacent sequences: A044247 A044248 A044249 * A044251 A044252 A044253

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved