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A284891
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Concatenation of the numbers from 3 to n.
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1
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3, 34, 345, 3456, 34567, 345678, 3456789, 345678910, 34567891011, 3456789101112, 345678910111213, 34567891011121314, 3456789101112131415, 345678910111213141516, 34567891011121314151617, 3456789101112131415161718, 345678910111213141516171819
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OFFSET
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3,1
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COMMENTS
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The a(3) = 3, a(19) = 345678910111213141516171819 are primes in this sequence (for n < 2800).
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LINKS
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CROSSREFS
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KEYWORD
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base,nonn,easy
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AUTHOR
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STATUS
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approved
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