

A071070


Minimal set of compositestrings in base 10.


11



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
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OFFSET

1,1


COMMENTS

Any composite number contains in its digits at least one of the term of this sequence and there is no smaller set.


REFERENCES

J. Shallit, Minimal primes, in J.Recreational Mathematics, vol. 30.2, pp. 113117,19992000
J.P. Delahaye, "Pour la science", (French edition of Scientific American), Juin 2002, p. 99


LINKS

Table of n, a(n) for n=1..32.
J. Shallit, Minimal primes, J. Recreational Mathematics, vol. 30.2, pp. 113117, 19992000.


CROSSREFS

Cf. A071062, A071071, A071072, A071073.
Sequence in context: A066071 A067013 A141607 * A047820 A034878 A173328
Adjacent sequences: A071067 A071068 A071069 * A071071 A071072 A071073


KEYWORD

fini,full,nice,nonn,base


AUTHOR

Benoit Cloitre, May 26 2002


STATUS

approved



