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A105238
Primes concatenated from four consecutive odd numbers.
1
23252729, 77798183, 115117119121, 197199201203, 211213215217, 221223225227, 227229231233, 265267269271, 281283285287, 311313315317, 317319321323, 343345347349, 373375377379, 397399401403, 403405407409, 433435437439
OFFSET
1,1
LINKS
FORMULA
For positive n: {Concatenate((2n+1), (2n+3), (2n+5), (2n+7))} Intersect {Primes A000040}.
MATHEMATICA
Select[FromDigits/@(Flatten[IntegerDigits[#]]&/@Partition[Range[ 1, 501, 2], 4, 1]), PrimeQ] (* Harvey P. Dale, Jul 18 2013 *)
CROSSREFS
Sequence in context: A157079 A321065 A183736 * A252396 A236366 A097617
KEYWORD
base,easy,nonn
AUTHOR
Jonathan Vos Post, Apr 12 2005
STATUS
approved