A105185 Least multiple of n such that every partial concatenation followed by a 9 is prime.

1, 4, 3, 8, 10, 30, 84, 56, 18, 100, 198, 108, 351, 42, 375, 128, 136, 450, 551, 600, 966, 66, 552, 336, 2125, 780, 594, 2576, 348, 2520, 4867, 288, 726, 1802, 5740, 2664, 6438, 722, 4446, 1080, 4674, 3150, 559, 1628, 8955, 3358, 15933, 576, 1764, 1700, 5763, 2652

Offset

1,2

Links

Table of n, a(n) for n=1..52.

Example

19,149,1439,14389,1438109,... etc. are all prime.

Crossrefs

Cf. A110436, A110437, A109744.

Sequence in context: A175047 A316688 A309517 * A357587 A165739 A196132

Adjacent sequences: A105182 A105183 A105184 * A105186 A105187 A105188

Keyword

base,nonn

Author

Amarnath Murthy, Aug 03 2005

Extensions

More terms from Jon E. Schoenfield, May 16 2010

Status

approved