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A213084 Numbers consisting of ones and eights. 3
1, 8, 11, 18, 81, 88, 111, 118, 181, 188, 811, 818, 881, 888, 1111, 1118, 1181, 1188, 1811, 1818, 1881, 1888, 8111, 8118, 8181, 8188, 8811, 8818, 8881, 8888, 11111, 11118, 11181, 11188, 11811, 11818, 11881, 11888, 18111, 18118, 18181, 18188, 18811, 18818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

One and eight begin with vowels. The subsequence of primes begins 11, 181, 811, 1181, 1811, 8111. - Jonathan Vos Post, Jun 14 2012

LINKS

Table of n, a(n) for n=1..44.

MATHEMATICA

Flatten[Table[FromDigits/@Tuples[{1, 8}, n], {n, 5}]] (* Harvey P. Dale, Aug 27 2014 *)

PROG

(Python)

res = []

i = 0

while len (res) < 260:

    for c in str(i):

        if c in '18':

            continue

        else:

            break

    else:

        res.append(i)

    i = i + 1

print(res)

(PARI) is(n) = #setintersect(vecsort(digits(n), , 8), [0, 2, 3, 4, 5, 6, 7, 9])==0 \\ Felix Fröhlich, Sep 09 2019

CROSSREFS

Cf. A020456 (primes in this sequence).

Cf. numbers consisting of 1s and ks: A007088 (k=0), A007931 (k=2), A032917 (k=3), A032822 (k=4), A276037 (k=5), A284293 (k=6), A276039 (k=7), A284294 (k=9).

Sequence in context: A318079 A000852 A000873 * A243520 A129730 A291664

Adjacent sequences:  A213081 A213082 A213083 * A213085 A213086 A213087

KEYWORD

nonn,base,dumb,easy,word

AUTHOR

Jens Ahlström, Jun 05 2012

STATUS

approved

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Last modified April 5 19:56 EDT 2020. Contains 333260 sequences. (Running on oeis4.)