A107646 Primes from concatenating twin primes.

3557, 355711131719

Offset

1,1

Links

Table of n, a(n) for n=1..2.

Chris Caldwell, The First 1,008 Twin Primes.

Example

3557 is a prime produced by concatenating twin primes (3,5) and (5,7).
355711131719 is a prime produced by concatenating twin primes (3,5), (5,7), (11,13) and (17,19).

Mathematica

tw = Select[ Prime@ Range@100000, PrimeQ[ # + 2] &]; tw = Flatten /@ IntegerDigits@ Transpose[{tw, tw + 2}]; t = {}; Do[p = FromDigits@ Flatten@ Table[ tw[[i]], {i, n}]; If[ PrimeQ[p], Print[p]], {n, 1090}] (* Robert G. Wilson v *)

Crossrefs

Sequence in context: A151810 A083955 A104207 * A204607 A204600 A204599

Adjacent sequences: A107643 A107644 A107645 * A107647 A107648 A107649

Keyword

hard,more,nonn,bref,base

Author

Parthasarathy Nambi, Jun 09 2005

Status

approved