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A110767
a(1) = 11 then the least number of concatenation of n that gives prime when placed on the most significant side of the previous concatenation.
0
11, 2, 33, 444, 55, 6, 777777777777
OFFSET
1,1
COMMENTS
Contribution from David Wasserman, Dec 30 2008: (Start)
Next term has 634 digits.
A088061 gives the primes. (End)
EXAMPLE
11,211,33211,44433211,5544433211,... are all primes.
CROSSREFS
Cf. A088061. [From David Wasserman, Dec 30 2008]
Sequence in context: A364697 A298439 A095157 * A089365 A130217 A096044
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Aug 12 2005
STATUS
approved