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A105238
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Primes concatenated from four consecutive odd numbers.
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1
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23252729, 77798183, 115117119121, 197199201203, 211213215217, 221223225227, 227229231233, 265267269271, 281283285287, 311313315317, 317319321323, 343345347349, 373375377379, 397399401403, 403405407409, 433435437439
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..1000
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FORMULA
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For positive n: {Concatenate((2n+1), (2n+3), (2n+5), (2n+7))} Intersect {Primes A000040}.
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MATHEMATICA
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Select[FromDigits/@(Flatten[IntegerDigits[#]]&/@Partition[Range[ 1, 501, 2], 4, 1]), PrimeQ] (* Harvey P. Dale, Jul 18 2013 *)
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CROSSREFS
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Cf. A000040, A032625.
Sequence in context: A157079 A321065 A183736 * A252396 A236366 A097617
Adjacent sequences: A105235 A105236 A105237 * A105239 A105240 A105241
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jonathan Vos Post, Apr 12 2005
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STATUS
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approved
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