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Search: id:A110780
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| A110780 |
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Copies of 1 and 9 alternately such that every partial concatenation is a prime. |
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+0
15
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| 11, 99999, 111111111, 9999999999, 11111111111111111111111111111111111111, 99999999999999999999999999999999999999999999999
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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11,1199999,1199999111111111,... are all prime.
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CROSSREFS
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Cf. A110774, A110775, A110776, A110777, A110778, A110781.
Sequence in context: A068647 A102367 A055322 this_sequence A087395 A049193 A079558
Adjacent sequences: A110777 A110778 A110779 this_sequence A110781 A110782 A110783
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 12 2005
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EXTENSIONS
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More terms from Joshua Zucker, Jan 11 2006
The next term has more than 800 1's and is too large to include.
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