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A105185
Least multiple of n such that every partial concatenation followed by a 9 is prime.
0
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
EXAMPLE
19,149,1439,14389,1438109,... etc. are all prime.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Aug 03 2005
EXTENSIONS
More terms from Jon E. Schoenfield, May 16 2010
STATUS
approved