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A110788
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Copies of 7 and 1 alternately such that every partial concatenation is a prime.
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10
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7, 1, 77, 1111, 77777, 1111111111, 77777777777777777777777, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 7,71,7177,71771111,... are all prime.
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CROSSREFS
| Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110782, A110783, A110789.
777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777
Sequence in context: A144450 A051339 A134141 * A100254 A119935 A027447
Adjacent sequences: A110785 A110786 A110787 * A110789 A110790 A110791
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 13 2005
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EXTENSIONS
| More terms from Joshua Zucker, Jan 11 2006
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