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.

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

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: A362347 A077703 A134705 * A219845 A041817 A365141

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