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Search: id:A110053
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| A110053 |
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Numbers n such that the string 111n is prime. |
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+0
2
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| 7, 13, 17, 19, 31, 49, 59, 61, 71, 73, 77, 97, 103, 109, 119, 121, 127, 143, 149, 187, 191, 211, 217, 227, 229, 253, 263, 269, 271, 301, 317, 323, 337, 341, 347, 373, 409, 427, 431, 439, 443, 467, 487, 491, 493, 497, 509, 521, 533, 539, 577
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If n=7 then 111n = 1117 (prime).
If n=73 then 111n = 11173 (prime).
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MATHEMATICA
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Select[Range[1000], PrimeQ[FromDigits[Join[{1, 1, 1}, IntegerDigits[ # ]]]] &] (Delarte)
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CROSSREFS
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Sequence in context: A032669 A147603 A106084 this_sequence A002733 A108334 A136083
Adjacent sequences: A110050 A110051 A110052 this_sequence A110054 A110055 A110056
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 04 2005
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EXTENSIONS
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More terms from Alonso Delarte (alonso.delarte(AT)gmail.com), Sep 06 2005
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