A105238 Primes concatenated from four consecutive odd numbers.

23252729, 77798183, 115117119121, 197199201203, 211213215217, 221223225227, 227229231233, 265267269271, 281283285287, 311313315317, 317319321323, 343345347349, 373375377379, 397399401403, 403405407409, 433435437439

Offset: 1

Author

Jonathan Vos Post, Apr 12 2005

Keywords

• base
• easy
• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000040, A032625.

Programs

Mathematica

Select[FromDigits/@(Flatten[IntegerDigits[#]]&/@Partition[Range[ 1,501,2],4,1]),PrimeQ] (* Harvey P. Dale, Jul 18 2013 *)

Formula

For positive n: {Concatenate((2n+1), (2n+3), (2n+5), (2n+7))} Intersect {Primes A000040}.