A104207 Concatenation of consecutive twin primes.

3557, 11131719, 29314143, 59617173, 101103107109, 137139149151, 179181191193, 197199227229, 239241269271, 281283311313, 347349419421, 431433461463, 521523569571, 599601617619, 641643659661, 809811821823, 827829857859, 88188310191021, 1031103310491051

Offset

0,1

Links

Table of n, a(n) for n=0..18.

Chris Caldwell, The First 1,008 Twin Primes.

Example

3557 is obtained by concatenating the consecutive pair of twin primes (3,5) and (5,7).
11131719 is obtained by concatenating the consecutive pair of twin primes (11,13) and (17,19).

Mathematica

With[{ll=Select[Partition[Prime[Range[200]], 2, 1], Last[#]-First[#] == 2&]}, Table[FromDigits[Flatten[IntegerDigits/@Take[ll, {2n-1, 2n}]]], {n, 20}]] (* Harvey P. Dale, Oct 25 2011 *)

Crossrefs

Sequence in context: A248855 A151810 A083955 * A107646 A204607 A204600

Adjacent sequences: A104204 A104205 A104206 * A104208 A104209 A104210

Keyword

nonn,base

Author

Parthasarathy Nambi, Apr 01 2005

Extensions

More terms from Harvey P. Dale, Oct 25 2011

Status

approved