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A124116
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a(n) the smallest positive integer such that a(n)+10^k is prime for k=1,2...n.
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0
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1, 1, 9, 9, 559, 847, 15127, 54621, 54621, 5893321, 167459299
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Infinite under Dickson's conjecture. [Charles R Greathouse IV, Jan 26 2012]
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FORMULA
| a(n) == 0 (mod 7) for n>5.
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EXAMPLE
| a(5)=559 because 569, 659, 1559, 10559 and 100559 are all prime
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CROSSREFS
| Sequence in context: A065242 A050720 A171738 * A058200 A067450 A109409
Adjacent sequences: A124113 A124114 A124115 * A124117 A124118 A124119
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KEYWORD
| hard,nonn
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AUTHOR
| Anton Vrba (antonvrba(AT)yahoo.com), Nov 28 2006
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