A043521 Numbers having one 8 in base 10.

8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 89, 98, 108, 118, 128, 138, 148, 158, 168, 178, 180, 181, 182, 183, 184, 185, 186, 187, 189, 198, 208, 218, 228, 238, 248, 258, 268, 278, 280, 281, 282, 283, 284, 285, 286, 287, 289, 298, 308, 318

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base
• easy

Links

• Enrique Pérez Herrero, Table of n, a(n) for n = 1..2000
• Index entries for 10-automatic sequences.

Crossrefs

Subsequence of A011538.

Cf. A043489, A043493, A043497, A043501, A043505, A043509, A043513, A043517, A043525, A011538.

Programs

Mathematica

Select[Range[300],DigitCount[#,10,8]==1&] (* Harvey P. Dale, Jan 06 2012 *)

PARI

is(n)=my(d=digits(n)); sum(i=1,#d, d[i]==8)==1 \\ Charles R Greathouse IV, Feb 12 2017

Python

def ok(n): return str(n).count('8') == 1
print(list(filter(ok, range(320)))) # Michael S. Branicky, Aug 18 2021