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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 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 A347757 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 September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)