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Search: id:A071070
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| A071070 |
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Minimal set of composite-strings in base 10. |
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+0
11
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| 4, 6, 8, 9, 10, 12, 15, 20, 21, 22, 25, 27, 30, 32, 33, 35, 50, 51, 52, 55, 57, 70, 72, 75, 77, 111, 117, 171, 371, 711, 713, 731
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Any composite number contains in its digits at least one of the term of this sequence and there is no smaller set.
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REFERENCES
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J. Shallit, Minimal primes, in J.Recreational Mathematics, vol. 30.2, pp. 113-117,1999-2000
J.-P. Delahaye, "Pour la science", (French edition of Scientific American), Juin 2002, p. 99
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LINKS
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J. Shallit, Minimal primes, J. Recreational Mathematics, vol. 30.2, pp. 113-117, 1999-2000.
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CROSSREFS
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Cf. A071062, A071071, A071072, A071073.
Sequence in context: A066071 A067013 A141607 this_sequence A047820 A034878 A116661
Adjacent sequences: A071067 A071068 A071069 this_sequence A071071 A071072 A071073
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KEYWORD
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fini,full,nice,nonn,base
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 26 2002
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