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A044234
Numbers n such that string 5,7 occurs in the base 8 representation of n but not of n-1.
1
47, 111, 175, 239, 303, 367, 376, 431, 495, 559, 623, 687, 751, 815, 879, 888, 943, 1007, 1071, 1135, 1199, 1263, 1327, 1391, 1400, 1455, 1519, 1583, 1647, 1711, 1775, 1839, 1903, 1912, 1967, 2031, 2095, 2159, 2223, 2287, 2351
OFFSET
1,1
LINKS
FORMULA
a(n) = 512*(n-7)/9 + 376 when n == 7 mod 9; otherwise a(n) = 64*(n - floor((n+1)/9) - 1) + 47. - Bob Selcoe, Apr 01 2016
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {5, 7}]>0, 1, 0], {n, 2500}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Jul 10 2024 *)
CROSSREFS
Cf. A007094.
Sequence in context: A142796 A201147 A142020 * A044615 A142057 A246932
KEYWORD
nonn,base
EXTENSIONS
Linear recurrence removed and terms a(54), a(126) etc. corrected by Georg Fischer, Jun 27 2019
STATUS
approved