A057104 The non-octal numbers: numbers containing an 8 or 9 (they cannot be mistaken for octal numbers).

8, 9, 18, 19, 28, 29, 38, 39, 48, 49, 58, 59, 68, 69, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 108, 109, 118, 119, 128, 129, 138, 139, 148, 149, 158, 159, 168, 169, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188

Offset

1,1

Links

Table of n, a(n) for n=1..61.

Example

'42' might be read as an octal number, but '48' could not be and so belongs to the sequence.

Mathematica

Select[Range[200], Max[IntegerDigits[#]]>7&] (* Harvey P. Dale, May 26 2018 *)

Prog

(PARI) isok(n) = vecmax(digits(n)) > 7; \\ Michel Marcus, Feb 18 2016
(Python)
def ok(n): return {'8', '9'} & set(str(n)) != set()
print(list(filter(ok, range(189)))) # Michael S. Branicky, Aug 09 2021

Crossrefs

Cf. A007094.

Sequence in context: A041128 A041551 A356699 * A359062 A095191 A050706

Adjacent sequences: A057101 A057102 A057103 * A057105 A057106 A057107

Keyword

easy,nonn,base

Author

Thomas Schulze (jazariel(AT)tiscalenet.it), Sep 12 2000

Status

approved