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Search: id:A110054
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| A110054 |
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Numbers n such that the string 222n is prime. |
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+0
2
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| 1, 29, 47, 59, 71, 73, 77, 79, 83, 91, 107, 109, 113, 127, 137, 149, 151, 161, 163, 193, 197, 199, 247, 269, 289, 293, 311, 317, 323, 329, 337, 347, 349, 361, 367, 379, 389, 403, 419, 437, 461, 493, 499, 511, 527, 533, 553, 557, 587, 601
(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 222n = 2221 (prime).
If n=91 then 222n = 22291 (prime).
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MATHEMATICA
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Select[Range[1000], PrimeQ[FromDigits[Join[{2, 2, 2}, IntegerDigits[ # ]]]] &] (Delarte)
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CROSSREFS
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Sequence in context: A108280 A077782 A059414 this_sequence A104912 A104913 A102852
Adjacent sequences: A110051 A110052 A110053 this_sequence A110055 A110056 A110057
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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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