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Search: id:A113889
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| A113889 |
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Smallest prime of the form: all sevens followed by prime(n); a(n) > prime(n); or 0 if no such prime exists. |
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1
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| 0, 73, 0, 0, 77711, 77713, 7717, 719, 7723, 77777777777777777729, 77731, 777737, 7741, 743, 77747, 7753, 7759, 761, 77777777767, 7777777777771, 773, 777777777777777777777777777777777777777777777777777777777777777779
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Prime(n) is all zeros followed by prime(n).This is all sevens followed by prime(n). Conjecture: a(n) is nonzero if n >4.
The conjecture has been verified for n<100. - Joshua Albert (jba138(AT)psu.edu), Jan 20 2006
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EXAMPLE
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a(9) = 7723, as 723 is composite, prime(9) = 23.
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CROSSREFS
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Cf. A113884, A114785, A113886, A113887, A114788.
Sequence in context: A135320 A135427 A028671 this_sequence A099191 A051325 A102050
Adjacent sequences: A113886 A113887 A113888 this_sequence A113890 A113891 A113892
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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 18 2005
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EXTENSIONS
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More terms from Joshua Albert (jba138(AT)psu.edu), Jan 20 2006
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