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Search: id:A052406
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| A052406 |
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Numbers without 4 as a digit. |
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+0
2
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| 0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 82, 83, 85, 86, 87, 88, 89
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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This is a frequent sequence on Chinese, Japanese and Korean elevator buttons - Jean-Sebastien Girard (circeus(AT)hotmail.com), Jul 28 2008
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LINKS
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Eric Weisstein's World of Mathematics, Uban Number
Wikipedia, Tetraphobia.
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PROGRAM
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(PARI) g(n) = { local(x, v, j, flag); for(x=1, n, v=Vec(Str(x)); flag=1; for(j=1, length(v), if(v[j]=="4", flag=0)); if(flag, print1(x", ") ) ) } - Cino Hilliard (hillcino368(AT)hotmail.com), Apr 01 2007
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CROSSREFS
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Cf. A004179, A004723.
Cf. A011760.
Sequence in context: A023839 A004723 A089590 this_sequence A022306 A081023 A031179
Adjacent sequences: A052403 A052404 A052405 this_sequence A052407 A052408 A052409
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KEYWORD
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base,easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Mar 13 2000
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