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Search: id:A110776
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| A110776 |
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Copies of 1 and 7 alternately such that every partial concatenation is a prime. |
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+0
16
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| 11, 777, 11, 777777, 111111111, 7777777777777777777777777, 111111111, 777
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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11,11777,1177711,... are all prime.
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CROSSREFS
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Cf. A110774, A110775, A110777, A110778, A112534, A110780, A110781, A110782, A110783, A110788, A110789
Sequence in context: A115737 A036933 A028457 this_sequence A058392 A100369 A162448
Adjacent sequences: A110773 A110774 A110775 this_sequence A110777 A110778 A110779
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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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Corrected and extended by Joshua Zucker, Jan 11 2006
The next term has 762 1's and is too large to include.
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