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Search: id:A089770
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| A089770 |
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Smallest n-digit prime containing no prime substrings, or 0 if no such number exists. |
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+0
3
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| 2, 11, 101, 1009, 10009, 100049, 1000081, 10000169, 100000049, 1000000009, 10000000069, 100000000069, 1000000000091, 10000000000099, 100000000000099, 1000000000000091, 10000000000000069, 100000000000000049
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3) = 149 is a term as 1,4,9,14,49 are all nonprimes. 199 is not a member as 19 is a prime.
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CROSSREFS
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Cf. A089768, A033274, A089771.
Sequence in context: A062397 A003617 A114018 this_sequence A069663 A121419 A099701
Adjacent sequences: A089767 A089768 A089769 this_sequence A089771 A089772 A089773
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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), Nov 23 2003
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EXTENSIONS
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Corrected and extended by David Wasserman (wasserma(AT)spawar.navy.mil), Oct 12 2005
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