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Search: id:A110055
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| A110055 |
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Numbers n such that the string 333n is prime. |
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+0
1
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| 1, 11, 17, 29, 31, 43, 47, 49, 53, 59, 77, 91, 101, 103, 107, 131, 139, 161, 187, 197, 209, 227, 233, 253, 269, 271, 283, 287, 299, 323, 331, 337, 341, 349, 367, 383, 397, 419, 427, 433, 439, 449, 451, 457, 479, 491, 493, 497, 503, 517, 533, 539, 563, 581, 589
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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If n=1 then 333n = 3331 (prime).
If n=59 then 333n = 33359 (prime).
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MATHEMATICA
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Select[Range[1000], PrimeQ[FromDigits[Join[{3, 3, 3}, IntegerDigits[ # ]]]] &] (Delarte)
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CROSSREFS
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Sequence in context: A126609 A079367 A120139 this_sequence A105886 A051634 A038918
Adjacent sequences: A110052 A110053 A110054 this_sequence A110056 A110057 A110058
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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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