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A124117
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a(n) the smallest composite number of n+1 digits that becomes a prime by incrementing any one of the higher order digits.
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0
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21, 129, 1003, 10681, 101829, 1020831, 10251129, 100780743, 1051460221, 10153541853, 103257526729, 1483112006019
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(4)=10681 as 20681, 11681, 10781 and 10691 are prime
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CROSSREFS
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KEYWORD
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hard,nonn,base
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AUTHOR
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Anton Vrba (antonvrba(AT)yahoo.com), Nov 28 2006
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EXTENSIONS
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STATUS
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approved
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