

A110433


a(1) = 1 then the least multiple of odd numbers not odd multiples of 5, (3,7,9,11,13,17,19,21,23,27,29,...) such that every partial concatenation is noncomposite.


0



1, 3, 7, 63, 77, 39, 357, 57, 21, 1909, 567, 1827, 713, 1353, 21349, 273, 533, 43, 4559, 7497, 1989, 1749, 5529, 49029, 7747, 3843, 1943, 1449, 13987, 24893, 11319, 50007, 2673, 14691, 23577, 147117, 28119, 11439, 57909, 7821, 3939, 41097, 2889, 78807
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OFFSET

1,2


COMMENTS

Pseudoprimality, but not primality, checked for some of the larger numbers involved here.  Joshua Zucker, May 11 2006


LINKS

Table of n, a(n) for n=1..44.


EXAMPLE

13, 137, 13763, 1376377 are all prime where 63 is a multiple of 9 and 77 is a multiple of 11.


CROSSREFS

Sequence in context: A258184 A077703 A134705 * A219845 A041817 A332259
Adjacent sequences: A110430 A110431 A110432 * A110434 A110435 A110436


KEYWORD

base,easy,nonn


AUTHOR

Amarnath Murthy, Aug 02 2005


EXTENSIONS

More terms from Joshua Zucker, May 11 2006


STATUS

approved



