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Search: id:A110778
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| A110778 |
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Copies of 3 and 7 alternately such that every partial concatenation is a prime. |
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+0
16
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| 3, 7, 3, 777, 333, 777777777777777777777, 3333333, 7777777777777777777777777777777, 33333
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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3,37,373,373777,... are all prime.
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CROSSREFS
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Cf. A110774, A110775, A110776, A110777.
Sequence in context: A049479 A125314 A050393 this_sequence A108297 A135928 A011444
Adjacent sequences: A110775 A110776 A110777 this_sequence A110779 A110780 A110781
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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 480 7's and is too large to include.
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