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A110782
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Copies of 1,3,7 and 9 cyclically such that every partial concatenation is a prime.
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12
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11, 3, 777, 999, 11, 33333333, 777777777777777777777, 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999, 1111111111111111111111111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 11,113,113777,113777999,... are all prime.
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CROSSREFS
| Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110783.
Sequence in context: A157781 A079841 A069869 * A088073 A010187 A114267
Adjacent sequences: A110779 A110780 A110781 * A110783 A110784 A110785
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 12 2005
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EXTENSIONS
| More terms from Joshua Zucker, Jan 11 2006
The next term is 726 3's and is too large to include.
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