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A023765 Nialpdromes: digits in base 9 are in nonincreasing order. 2
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 18, 19, 20, 27, 28, 29, 30, 36, 37, 38, 39, 40, 45, 46, 47, 48, 49, 50, 54, 55, 56, 57, 58, 59, 60, 63, 64, 65, 66, 67, 68, 69, 70, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 90, 91, 162, 171, 172, 180, 181, 182, 243, 252, 253, 261 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
From Michael De Vlieger, Oct 17 2018: (Start)
10 is in the sequence because 10 in base 9 is "11"; these digits are nondecreasing.
12 is not in the sequence because its base-9 digits "13" increase. (End)
MATHEMATICA
Select[Range[0, 2000], Max[Differences[IntegerDigits[#, 9]]]<=0&] (* Vincenzo Librandi, Dec 26 2012 *)
Select[Range[0, 261], GreaterEqual@@IntegerDigits[#, 9]&] (* Ray Chandler, Jan 06 2014 *)
Select[Range@ 200, AllTrue[Differences@ IntegerDigits[#, 9], # <= 0 &] &] (* Michael De Vlieger, Oct 17 2018 *)
CROSSREFS
Sequence in context: A347295 A032872 A032345 * A032906 A349484 A075905
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved

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Last modified June 16 19:52 EDT 2024. Contains 373432 sequences. (Running on oeis4.)