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A090508
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Least number beginning with prime(n) such that every concatenation is a prime.
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1
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2, 3, 51, 71, 1137, 1321, 1727, 1947, 2383, 2919, 311, 3723, 4173, 43197, 47307, 531, 59103, 6117, 67279, 7191, 73457, 79159, 8379, 8913, 97697, 1011483, 10399, 107151, 10959, 113529, 12713, 1311171, 137649, 139101, 149107, 1511229, 15743, 163639
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OFFSET
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1,1
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LINKS
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MAPLE
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l:=[]: for n from 1 to 40 do p:=ithprime(n): m:=p: lcon:=cat(op(l)): for i from 1 do if(isprime(parse(cat(lcon, m)))) then l:=[op(l), m]: break fi: m:=parse(cat(p, 2*i-1)) od od: op(l); # C. Ronaldo
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 18 2005
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STATUS
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approved
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