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A110053
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Numbers n such that the string 111n is the decimal expansion of a prime number.
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1
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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, 581, 593, 599
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 7 is in the sequence because 1117 is prime.
73 is in the sequence because 11173 is prime.
103 is in the sequence because 111103 is prime.
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MATHEMATICA
| Select[Range[1000], PrimeQ[FromDigits[Join[{1, 1, 1}, IntegerDigits[ # ]]]] &] (Delarte)
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PROG
| (MAGMA) [ n: n in [1..600] | IsPrime(Seqint(Intseq(n) cat [1, 1, 1])) ];
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CROSSREFS
| Sequence in context: A032669 A147603 A106084 * A180263 A002733 A108334
Adjacent sequences: A110050 A110051 A110052 * A110054 A110055 A110056
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KEYWORD
| nonn,base
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 04 2005
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EXTENSIONS
| More terms from Alonso Delarte (alonso.delarte(AT)gmail.com), Sep 06 2005
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