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A110615 Minimal set of composite-strings in base 12 in the sense of A071070. 3
4, 6, 8, 9, 10, 12, 14, 15, 24, 25, 26, 27, 35, 36, 38, 39, 60, 62, 63, 65, 84, 85, 86, 87, 91, 95, 132, 133, 134, 135, 143, 161, 205, 215, 355, 377, 445, 451, 455, 493, 1651, 1673, 1885, 1891, 1895, 8797 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Maple worksheet available upon request. Here is the sequence of minimal composites in base 12, where X is 10 and E is 11. 4, 6, 8, 9, X, 10, 12, 13, 20, 21, 22, 23, 2E, 30, 32, 33, 50, 52, 53, 55, 70, 71, 72, 73, 77, 7E, E0, E1, E2, E3, EE, 115, 151, 15E, 257, 275, 311, 317, 31E, 351, E57, E75, 1111, 1117, 111E, 5111.

LINKS

Table of n, a(n) for n=1..46.

EXAMPLE

a(13)=35=2E since no earlier composite is of the form "*2*E*". The list of minimal composites can be constructed using a sieve-like process: subsequently eliminate from the list of composites all composites of the form "*2*E*". Assuming all previous terms have been similarly determined, then the next remaining composite should be 30.

CROSSREFS

Cf. A071062, A071070.

Sequence in context: A282668 A117097 A077135 * A060679 A051234 A102554

Adjacent sequences:  A110612 A110613 A110614 * A110616 A110617 A110618

KEYWORD

nonn

AUTHOR

Walter Kehowski, Sep 14 2005; name corrected Sep 18 2005

STATUS

approved

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Last modified April 25 13:31 EDT 2019. Contains 322461 sequences. (Running on oeis4.)